<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 6.5.2

Error message:
Ошибка доступа к памяти.

Трассировка стека:
(00B74789) C4406_0
(00EF4EAE)
(00EF6F26)
(00EF3CD0) __ExceptionHandler
(000B343F) ntdll.dll
(0007A66A) ntdll.dll.KiUserExceptionDispatcher
(00B74960) C4406_0
(00B8947E) _ssh_sw_abort_deferred
(00B89745) _ssh_is_bare
(00C9445D) TSecureShell::Open
(00D2FD72) TTerminal::Open
(00C48CA3) TTerminalThread::TerminalOpenEvent
(00C43A20) TSignalThread::Execute
(000DF47F) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006C6D9) ntdll.dll
(0006C65C) ntdll.dll

(00EF5519)
(00EF6AF3)
(00C94644) TSecureShell::Open
(00D2FD72) TTerminal::Open
(00C48CA3) TTerminalThread::TerminalOpenEvent
(00C43A20) TSignalThread::Execute
(000DF47F) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006C6D9) ntdll.dll
(0006C65C) ntdll.dll

(00EF5519)
(00EF6AF3)
(00D2FF1A) TTerminal::Open
(00C48CA3) TTerminalThread::TerminalOpenEvent
(00C43A20) TSignalThread::Execute
(000DF47F) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006C6D9) ntdll.dll
(0006C65C) ntdll.dll

(00B74789) C4406_0
(00EF4EAE)
(00EF6F26)
(00EF3CD0) __ExceptionHandler
(000B343F) ntdll.dll
(0007A66A) ntdll.dll.KiUserExceptionDispatcher
(00B74960) C4406_0
(00B88CB4) _ssh_conn_processed_data
(00B89778) _ssh_is_bare
(00C99B58) TSecureShell::FreeBackend
(00C92C18) TSecureShell::~TSecureShell
(00D3013B) TTerminal::Open
(00C48CA3) TTerminalThread::TerminalOpenEvent
(00C43A20) TSignalThread::Execute
(000DF47F) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006C6D9) ntdll.dll
(0006C65C) ntdll.dll

(00EF5519)
(00EF6AF3)
(00D30542) TTerminal::Open
(00C48CA3) TTerminalThread::TerminalOpenEvent
(00C43A20) TSignalThread::Execute
(000DF47F) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006C6D9) ntdll.dll
(0006C65C) ntdll.dll

The problem happens rarely. I cannot reproduce it.

@ruzsinszky.attila: Thanks for your report.
I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 6.5.3

Error message:
Érvénytelen memóriaelérés

Veremkivonat:
(00B751A3) C4406_0
(00EF5B8E)
(00EF7C06)
(00EF49B0) __ExceptionHandler
(0008818F) ntdll.dll
(00074711) ntdll.dll.KiUserExceptionDispatcher
(00B7537C) C4406_0
(00B89E9A) _ssh_sw_abort_deferred
(00B8A161) _ssh_is_bare
(00C94EC1) TSecureShell::Open
(00D319DE) TTerminal::OpenTunnel
(00D30325) TTerminal::Open
(00C49707) TTerminalThread::TerminalOpenEvent
(00C44484) TSignalThread::Execute
(000DF47F) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(000672AC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00067279) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00EF61F9)
(00EF77D3)
(00C950A8) TSecureShell::Open
(00D319DE) TTerminal::OpenTunnel
(00D30325) TTerminal::Open
(00C49707) TTerminalThread::TerminalOpenEvent
(00C44484) TSignalThread::Execute
(000DF47F) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(000672AC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00067279) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00B751A3) C4406_0
(00EF5B8E)
(00EF7C06)
(00EF49B0) __ExceptionHandler
(0008818F) ntdll.dll
(00074711) ntdll.dll.KiUserExceptionDispatcher
(00B7537C) C4406_0
(00B896D0) _ssh_conn_processed_data
(00B8A194) _ssh_is_bare
(00C9A5BC) TSecureShell::FreeBackend
(00C9367C) TSecureShell::~TSecureShell
(00D32AC1) TTerminal::CloseTunnel
(00D31B24) TTerminal::OpenTunnel
(00D30325) TTerminal::Open
(00C49707) TTerminalThread::TerminalOpenEvent
(00C44484) TSignalThread::Execute
(000DF47F) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(000672AC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00067279) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00EF61F9)
(00EF77D3)
(00D30FA6) TTerminal::Open
(00C49707) TTerminalThread::TerminalOpenEvent
(00C44484) TSignalThread::Execute
(000DF47F) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(000672AC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00067279) ntdll.dll.RtlGetAppContainerNamedObjectPath

I know how to reproduce the problem or the problem happens frequently enough. I wish to be contacted by the WinSCP team to help resolving the problem.

@rjavierch: Thanks for your report.
I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>
Hello! I hope you are doing very fine. Im not an avid user but here we go.
I'm trying to connect to my remote server, I can successfully access the server through putty ssh.

My connection path is

laptop (windows) -> work pc through proxy using tailscale vpn (windows) -> remote server at work through ssh (fedora).

I imported the same configuration from putty to winscp, so i can sftp the server becuase im gettint this error.

WinSCP 6.5.3

Error message:
Invalid access to memory.

Stack trace:
(00B751A3) C4406_0
(00EF5B8E)
(00EF7C06)
(00EF49B0) __ExceptionHandler
(000B204F) ntdll.dll
(0007AF3A) ntdll.dll.KiUserExceptionDispatcher
(00B7537C) C4406_0
(00B89E9A) _ssh_sw_abort_deferred
(00B8A161) _ssh_is_bare
(00C94EC1) TSecureShell::Open
(00D307D6) TTerminal::Open
(00C49707) TTerminalThread::TerminalOpenEvent
(00C44484) TSignalThread::Execute
(000DF47F) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006C2F9) ntdll.dll
(0006C27C) ntdll.dll

(00EF61F9)
(00EF77D3)
(00C950A8) TSecureShell::Open
(00D307D6) TTerminal::Open
(00C49707) TTerminalThread::TerminalOpenEvent
(00C44484) TSignalThread::Execute
(000DF47F) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006C2F9) ntdll.dll
(0006C27C) ntdll.dll

(00EF61F9)
(00EF77D3)
(00D3097E) TTerminal::Open
(00C49707) TTerminalThread::TerminalOpenEvent
(00C44484) TSignalThread::Execute
(000DF47F) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006C2F9) ntdll.dll
(0006C27C) ntdll.dll

(00B751A3) C4406_0
(00EF5B8E)
(00EF7C06)
(00EF49B0) __ExceptionHandler
(000B204F) ntdll.dll
(0007AF3A) ntdll.dll.KiUserExceptionDispatcher
(00B7537C) C4406_0
(00B896D0) _ssh_conn_processed_data
(00B8A194) _ssh_is_bare
(00C9A5BC) TSecureShell::FreeBackend
(00C9367C) TSecureShell::~TSecureShell
(00D30B9F) TTerminal::Open
(00C49707) TTerminalThread::TerminalOpenEvent
(00C44484) TSignalThread::Execute
(000DF47F) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006C2F9) ntdll.dll
(0006C27C) ntdll.dll

(00EF61F9)
(00EF77D3)
(00D30FA6) TTerminal::Open
(00C49707) TTerminalThread::TerminalOpenEvent
(00C44484) TSignalThread::Execute
(000DF47F) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006C2F9) ntdll.dll
(0006C27C) ntdll.dll

I know how to reproduce the problem or the problem happens frequently enough. I wish to be contacted by the WinSCP team to help resolving the problem.

@Matthias.Triebsch: Thanks for your report.
I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.

Some Connection dont work.
Putty connections to the same hosts have no Problems

WinSCP 6.5.3

Error message:
Invalid access to memory.

Stack trace:
(F28B4653)WinSCP.exe
(00EF5B8E)
(00EF7C06)
(00EF49B0) __ExceptionHandler
(0008818F) ntdll.dll
(00074711) ntdll.dll.KiUserExceptionDispatcher
(00B7537C) C4406_0
(00B89E9A) _ssh_sw_abort_deferred
(00B8A161) _ssh_is_bare
(00C94EC1) TSecureShell::Open
(00D307D6) TTerminal::Open
(00C49707) TTerminalThread::TerminalOpenEvent
(00C44484) TSignalThread::Execute
(000DF47F) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(000672AC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00067279) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00EF61F9)
(00EF77D3)
(00C950A8) TSecureShell::Open
(00D307D6) TTerminal::Open
(00C49707) TTerminalThread::TerminalOpenEvent
(00C44484) TSignalThread::Execute
(000DF47F) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(000672AC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00067279) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00EF61F9)
(00EF77D3)
(00D3097E) TTerminal::Open
(00C49707) TTerminalThread::TerminalOpenEvent
(00C44484) TSignalThread::Execute
(000DF47F) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(000672AC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00067279) ntdll.dll.RtlGetAppContainerNamedObjectPath

(F28B4653)WinSCP.exe
(00EF5B8E)
(00EF7C06)
(00EF49B0) __ExceptionHandler
(0008818F) ntdll.dll
(00074711) ntdll.dll.KiUserExceptionDispatcher
(00B7537C) C4406_0
(00B896D0) _ssh_conn_processed_data
(00B8A194) _ssh_is_bare
(00C9A5BC) TSecureShell::FreeBackend
(00C9367C) TSecureShell::~TSecureShell
(00D30B9F) TTerminal::Open
(00C49707) TTerminalThread::TerminalOpenEvent
(00C44484) TSignalThread::Execute
(000DF47F) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(000672AC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00067279) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00EF61F9)
(00EF77D3)
(00D30FA6) TTerminal::Open
(00C49707) TTerminalThread::TerminalOpenEvent
(00C44484) TSignalThread::Execute
(000DF47F) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(000672AC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00067279) ntdll.dll.RtlGetAppContainerNamedObjectPath

I know how to reproduce the problem or the problem happens frequently enough. I wish to be contacted by the WinSCP team to help resolving the problem.

@lindberg.williams.jr: Thanks for your report.

I have added this issue to the tracker:
Issue 2376 – Failure when proxy hostname resolution fails with SFTP/SCP protocols

@anuja.dhoke: Thanks for your report.
I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 6.5.1

Error message:
Invalid access to memory.

Stack trace:
(00B748CD) C4406_0
(00EF4DCA)
(00EF6E42)
(00EF3BEC) __ExceptionHandler
(000B0C7F) ntdll.dll
(0007ABCA) ntdll.dll.KiUserExceptionDispatcher
(00B893FE) _ssh_sw_abort_deferred
(00B896C5) _ssh_is_bare
(00C94379) TSecureShell::Open
(00D2FC8E) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

(00EF5435)
(00EF6A0F)
(00C94560) TSecureShell::Open
(00D2FC8E) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

(00EF5435)
(00EF6A0F)
(00D2FE36) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

(00B748CD) C4406_0
(00EF4DCA)
(00EF6E42)
(00EF3BEC) __ExceptionHandler
(000B0C7F) ntdll.dll
(0007ABCA) ntdll.dll.KiUserExceptionDispatcher
(00B88C34) _ssh_conn_processed_data
(00B896F8) _ssh_is_bare
(00C99A74) TSecureShell::FreeBackend
(00C92B34) TSecureShell::~TSecureShell
(00D30057) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

(00EF5435)
(00EF6A0F)
(00D3045E) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

I know how to reproduce the problem or the problem happens frequently enough. I wish to be contacted by the WinSCP team to help resolving the problem.

@lindberg.williams.jr, @magdeline.mashego, @jason.kannanthanathu: Thanks for your reports.
I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 6.5.1

Error message:
Unzulässiger Zugriff auf einen Speicherbereich.

Stapelverfolgung:
(00B748CD) C4406_0
(00EF4DCA)
(00EF6E42)
(00EF3BEC) __ExceptionHandler
(00087A7F) ntdll.dll
(000740D1) ntdll.dll.KiUserExceptionDispatcher
(00B893FE) _ssh_sw_abort_deferred
(00B896C5) _ssh_is_bare
(00C94379) TSecureShell::Open
(00D2FC8E) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(00066C6C) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00066C39) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00EF5435)
(00EF6A0F)
(00C94560) TSecureShell::Open
(00D2FC8E) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(00066C6C) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00066C39) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00EF5435)
(00EF6A0F)
(00D2FE36) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(00066C6C) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00066C39) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00B748CD) C4406_0
(00EF4DCA)
(00EF6E42)
(00EF3BEC) __ExceptionHandler
(00087A7F) ntdll.dll
(000740D1) ntdll.dll.KiUserExceptionDispatcher
(00B88C34) _ssh_conn_processed_data
(00B896F8) _ssh_is_bare
(00C99A74) TSecureShell::FreeBackend
(00C92B34) TSecureShell::~TSecureShell
(00D30057) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(00066C6C) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00066C39) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00EF5435)
(00EF6A0F)
(00D3045E) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(00066C6C) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00066C39) ntdll.dll.RtlGetAppContainerNamedObjectPath

I know how to reproduce the problem or the problem happens frequently enough. I wish to be contacted by the WinSCP team to help resolving the problem.

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 6.5.1

Error message:
Invalid access to memory.

Stack trace:
(00B748CD) C4406_0
(00EF4DCA)
(00EF6E42)
(00EF3BEC) __ExceptionHandler
(000990DF) ntdll.dll
(000783C1) ntdll.dll.KiUserExceptionDispatcher
(00B893FE) _ssh_sw_abort_deferred
(00B896C5) _ssh_is_bare
(00C94379) TSecureShell::Open
(00D2FC8E) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00016BA7) KERNEL32.DLL.BaseThreadInitThunk
(0006B2E9) ntdll.dll
(0006B26A) ntdll.dll

(00EF5435)
(00EF6A0F)
(00C94560) TSecureShell::Open
(00D2FC8E) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00016BA7) KERNEL32.DLL.BaseThreadInitThunk
(0006B2E9) ntdll.dll
(0006B26A) ntdll.dll

(00EF5435)
(00EF6A0F)
(00D2FE36) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00016BA7) KERNEL32.DLL.BaseThreadInitThunk
(0006B2E9) ntdll.dll
(0006B26A) ntdll.dll

(00B748CD) C4406_0
(00EF4DCA)
(00EF6E42)
(00EF3BEC) __ExceptionHandler
(000990DF) ntdll.dll
(000783C1) ntdll.dll.KiUserExceptionDispatcher
(00B88C34) _ssh_conn_processed_data
(00B896F8) _ssh_is_bare
(00C99A74) TSecureShell::FreeBackend
(00C92B34) TSecureShell::~TSecureShell
(00D30057) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00016BA7) KERNEL32.DLL.BaseThreadInitThunk
(0006B2E9) ntdll.dll
(0006B26A) ntdll.dll

(00EF5435)
(00EF6A0F)
(00D3045E) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00016BA7) KERNEL32.DLL.BaseThreadInitThunk
(0006B2E9) ntdll.dll
(0006B26A) ntdll.dll

I know how to reproduce the problem or the problem happens frequently enough. I wish to be contacted by the WinSCP team to help resolving the problem.

I found out how to prevent the problem as it were, and for me, it had much to do with human error. For one, the HTTP Connect Method proxy was not, in fact, host 127.0.0.1 and TCP port 8123, but some other non-localhost on the local network and one not even running anything on TCP port 8123, and more importantly having a fake (NXDOMAIN) FQDN (a bit like, say, "shell.example.lol" [without the quotes]) that wouldn't be resolved anyway directly through WinSCP. Additionally, this particular host and TCP port 22 is the one I was intending to connect to through a HTTP Connect Method proxy at host 127.0.0.1 and TCP port 8123, a particularly-configured server daemon that would return a suitable Internet address for the fake FQDN.

For me, this problem is solved, and I'm intending to help by providing further information. Oddly the connection failure and error message occurred even though there was no infinitely-recursive proxy loop mistake involved as not even the initial connection was possible. However, something like that likely would've caused the WinSCP instance to freeze and lock up before causing the whole thing to crash or possibly even the whole session of the operating system.

L.

WinSCP 6.5.1

Error message:
Invalid access to memory.

Stack trace:
(00B748CD) C4406_0
(00EF4DCA)
(00EF6E42)
(00EF3BEC) __ExceptionHandler
(000B0C7F) ntdll.dll
(0007ABCA) ntdll.dll.KiUserExceptionDispatcher
(00B893FE) _ssh_sw_abort_deferred
(00B896C5) _ssh_is_bare
(00C94379) TSecureShell::Open
(00D2FC8E) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

(00EF5435)
(00EF6A0F)
(00C94560) TSecureShell::Open
(00D2FC8E) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

(00EF5435)
(00EF6A0F)
(00D2FE36) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

(00B748CD) C4406_0
(00EF4DCA)
(00EF6E42)
(00EF3BEC) __ExceptionHandler
(000B0C7F) ntdll.dll
(0007ABCA) ntdll.dll.KiUserExceptionDispatcher
(00B88C34) _ssh_conn_processed_data
(00B896F8) _ssh_is_bare
(00C99A74) TSecureShell::FreeBackend
(00C92B34) TSecureShell::~TSecureShell
(00D30057) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

(00EF5435)
(00EF6A0F)
(00D3045E) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

I know how to reproduce the problem or the problem happens frequently enough. I wish to be contacted by the WinSCP team to help resolving the problem.

The error happens when connecting to more than one host and more than two sessions, using more than one type of password-protected key, through the same HTTP Connect Method proxy running on host 127.0.0.1 and TCP port 8123; with the offending key being a password-protected RSA key, whereas the two sessions that succeeded were with the same password-protected DSA key to the same host.

If I'm able to reproduce this error in the same way or different ways, then my next message will involve opting into being contacted by the WinSCP team. I've taken note of other public reports from other people pertaining to the same error as they and their machines have experienced it in the past and general vicinity of time early in the year 2025.

L.

WinSCP 6.5.1

Error message:
Invalid access to memory.

Stack trace:
(00B748CD) C4406_0
(00EF4DCA)
(00EF6E42)
(00EF3BEC) __ExceptionHandler
(000B0C7F) ntdll.dll
(0007ABCA) ntdll.dll.KiUserExceptionDispatcher
(00B893FE) _ssh_sw_abort_deferred
(00B896C5) _ssh_is_bare
(00C94379) TSecureShell::Open
(00D2FC8E) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

(00EF5435)
(00EF6A0F)
(00C94560) TSecureShell::Open
(00D2FC8E) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

(00EF5435)
(00EF6A0F)
(00D2FE36) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

(00B748CD) C4406_0
(00EF4DCA)
(00EF6E42)
(00EF3BEC) __ExceptionHandler
(000B0C7F) ntdll.dll
(0007ABCA) ntdll.dll.KiUserExceptionDispatcher
(00B88C34) _ssh_conn_processed_data
(00B896F8) _ssh_is_bare
(00C99A74) TSecureShell::FreeBackend
(00C92B34) TSecureShell::~TSecureShell
(00D30057) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

(00EF5435)
(00EF6A0F)
(00D3045E) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

The problem happens rarely. I cannot reproduce it.

@akish1960: Thanks for your report.
I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.

As soon as I tried to connect to the sftp site, I get this message. It worked just fine on versions of Winscp prior to 6.5.0. I just updated to 6.5.1 thinking the issue may have been reported by someone else and fixed, but the issue still remains.

WinSCP 6.5.1

Error message:
Invalid access to memory.

Stack trace:
(00B748CD) C4406_0
(00EF4DCA)
(00EF6E42)
(00EF3BEC) __ExceptionHandler
(000990DF) ntdll.dll
(000783C1) ntdll.dll.KiUserExceptionDispatcher
(00B893FE) _ssh_sw_abort_deferred
(00B896C5) _ssh_is_bare
(00C94379) TSecureShell::Open
(00D2FC8E) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00016BA7) KERNEL32.DLL.BaseThreadInitThunk
(0006B2E9) ntdll.dll
(0006B26A) ntdll.dll

(00EF5435)
(00EF6A0F)
(00C94560) TSecureShell::Open
(00D2FC8E) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00016BA7) KERNEL32.DLL.BaseThreadInitThunk
(0006B2E9) ntdll.dll
(0006B26A) ntdll.dll

(00EF5435)
(00EF6A0F)
(00D2FE36) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00016BA7) KERNEL32.DLL.BaseThreadInitThunk
(0006B2E9) ntdll.dll
(0006B26A) ntdll.dll

(00B748CD) C4406_0
(00EF4DCA)
(00EF6E42)
(00EF3BEC) __ExceptionHandler
(000990DF) ntdll.dll
(000783C1) ntdll.dll.KiUserExceptionDispatcher
(00B88C34) _ssh_conn_processed_data
(00B896F8) _ssh_is_bare
(00C99A74) TSecureShell::FreeBackend
(00C92B34) TSecureShell::~TSecureShell
(00D30057) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00016BA7) KERNEL32.DLL.BaseThreadInitThunk
(0006B2E9) ntdll.dll
(0006B26A) ntdll.dll

(00EF5435)
(00EF6A0F)
(00D3045E) TTerminal::Open
(00C48BBF) TTerminalThread::TerminalOpenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00016BA7) KERNEL32.DLL.BaseThreadInitThunk
(0006B2E9) ntdll.dll
(0006B26A) ntdll.dll

I know how to reproduce the problem or the problem happens frequently enough. I wish to be contacted by the WinSCP team to help resolving the problem.

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 6.5

Error message:
Invalid access to memory.

Stack trace:
(00B74789) C4406_0
(00EF4C46)
(00EF6CBE)
(00EF3A68) __ExceptionHandler
(000B0F5F) ntdll.dll
(0007ACBA) ntdll.dll.KiUserExceptionDispatcher
(00B892BA) _ssh_sw_abort_deferred
(00B89581) _ssh_is_bare
(00C94215) TSecureShell::Open
(00D2FB2A) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BFF9) ntdll.dll
(0006BF7C) ntdll.dll

(00EF52B1)
(00EF688B)
(00C943FC) TSecureShell::Open
(00D2FB2A) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BFF9) ntdll.dll
(0006BF7C) ntdll.dll

(00EF52B1)
(00EF688B)
(00D2FCD2) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BFF9) ntdll.dll
(0006BF7C) ntdll.dll

(00B74789) C4406_0
(00EF4C46)
(00EF6CBE)
(00EF3A68) __ExceptionHandler
(000B0F5F) ntdll.dll
(0007ACBA) ntdll.dll.KiUserExceptionDispatcher
(00B88AF0) _ssh_conn_processed_data
(00B895B4) _ssh_is_bare
(00C99910) TSecureShell::FreeBackend
(00C929D0) TSecureShell::~TSecureShell
(00D2FEF3) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BFF9) ntdll.dll
(0006BF7C) ntdll.dll

(00EF52B1)
(00EF688B)
(00D302FA) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BFF9) ntdll.dll
(0006BF7C) ntdll.dll

The problem happens rarely. I cannot reproduce it.

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 6.5

Error message:
Invalid access to memory.

Stack trace:
(00B74789) C4406_0
(00EF4C46)
(00EF6CBE)
(00EF3A68) __ExceptionHandler
(000990DF) ntdll.dll
(000783C1) ntdll.dll.KiUserExceptionDispatcher
(00B892BA) _ssh_sw_abort_deferred
(00B89581) _ssh_is_bare
(00C94215) TSecureShell::Open
(00D2FB2A) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(00016BA7) KERNEL32.DLL.BaseThreadInitThunk
(0006B2E9) ntdll.dll
(0006B26A) ntdll.dll

(00EF52B1)
(00EF688B)
(00C943FC) TSecureShell::Open
(00D2FB2A) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(00016BA7) KERNEL32.DLL.BaseThreadInitThunk
(0006B2E9) ntdll.dll
(0006B26A) ntdll.dll

(00EF52B1)
(00EF688B)
(00D2FCD2) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(00016BA7) KERNEL32.DLL.BaseThreadInitThunk
(0006B2E9) ntdll.dll
(0006B26A) ntdll.dll

(00B74789) C4406_0
(00EF4C46)
(00EF6CBE)
(00EF3A68) __ExceptionHandler
(000990DF) ntdll.dll
(000783C1) ntdll.dll.KiUserExceptionDispatcher
(00B88AF0) _ssh_conn_processed_data
(00B895B4) _ssh_is_bare
(00C99910) TSecureShell::FreeBackend
(00C929D0) TSecureShell::~TSecureShell
(00D2FEF3) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(00016BA7) KERNEL32.DLL.BaseThreadInitThunk
(0006B2E9) ntdll.dll
(0006B26A) ntdll.dll

(00EF52B1)
(00EF688B)
(00D302FA) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(00016BA7) KERNEL32.DLL.BaseThreadInitThunk
(0006B2E9) ntdll.dll
(0006B26A) ntdll.dll

The problem happens rarely. I cannot reproduce it.

@konayen001: Thanks for your report.
I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.

Stack trace:
(00B74789) C4406_0
(00EF4C46)
(00EF6CBE)
(00EF3A68) __ExceptionHandler
(000B0C7F) ntdll.dll
(0007ABCA) ntdll.dll.KiUserExceptionDispatcher
(00B892BA) _ssh_sw_abort_deferred
(00B89581) _ssh_is_bare
(00C94215) TSecureShell::Open
(00D2FB2A) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

(00EF52B1)
(00EF688B)
(00C943FC) TSecureShell::Open
(00D2FB2A) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

(00EF52B1)
(00EF688B)
(00D2FCD2) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

(00B74789) C4406_0
(00EF4C46)
(00EF6CBE)
(00EF3A68) __ExceptionHandler
(000B0C7F) ntdll.dll
(0007ABCA) ntdll.dll.KiUserExceptionDispatcher
(00B88AF0) _ssh_conn_processed_data
(00B895B4) _ssh_is_bare
(00C99910) TSecureShell::FreeBackend
(00C929D0) TSecureShell::~TSecureShell
(00D2FEF3) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

(00EF52B1)
(00EF688B)
(00D302FA) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll
<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 6.5

Error message:
Invalid access to memory.

Stack trace:
(00B74789) C4406_0
(00EF4C46)
(00EF6CBE)
(00EF3A68) __ExceptionHandler
(000B0C7F) ntdll.dll
(0007ABCA) ntdll.dll.KiUserExceptionDispatcher
(00B892BA) _ssh_sw_abort_deferred
(00B89581) _ssh_is_bare
(00C94215) TSecureShell::Open
(00D2FB2A) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

(00EF52B1)
(00EF688B)
(00C943FC) TSecureShell::Open
(00D2FB2A) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

(00EF52B1)
(00EF688B)
(00D2FCD2) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

(00B74789) C4406_0
(00EF4C46)
(00EF6CBE)
(00EF3A68) __ExceptionHandler
(000B0C7F) ntdll.dll
(0007ABCA) ntdll.dll.KiUserExceptionDispatcher
(00B88AF0) _ssh_conn_processed_data
(00B895B4) _ssh_is_bare
(00C99910) TSecureShell::FreeBackend
(00C929D0) TSecureShell::~TSecureShell
(00D2FEF3) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

(00EF52B1)
(00EF688B)
(00D302FA) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

I know how to reproduce the problem or the problem happens frequently enough. I wish to be contacted by the WinSCP team to help resolving the problem.

@yyguan03: Thanks for your report.
I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 6.5

Error message:
Invalid access to memory.

Stack trace:
(00B74789) C4406_0
(00EF4C46)
(00EF6CBE)
(00EF3A68) __ExceptionHandler
(0008818F) ntdll.dll
(00074711) ntdll.dll.KiUserExceptionDispatcher
(00B892BA) _ssh_sw_abort_deferred
(00B89581) _ssh_is_bare
(00C94215) TSecureShell::Open
(00D2FB2A) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(000672AC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00067279) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00EF52B1)
(00EF688B)
(00C943FC) TSecureShell::Open
(00D2FB2A) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(000672AC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00067279) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00EF52B1)
(00EF688B)
(00D2FCD2) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(000672AC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00067279) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00B74789) C4406_0
(00EF4C46)
(00EF6CBE)
(00EF3A68) __ExceptionHandler
(0008818F) ntdll.dll
(00074711) ntdll.dll.KiUserExceptionDispatcher
(00B88AF0) _ssh_conn_processed_data
(00B895B4) _ssh_is_bare
(00C99910) TSecureShell::FreeBackend
(00C929D0) TSecureShell::~TSecureShell
(00D2FEF3) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(000672AC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00067279) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00EF52B1)
(00EF688B)
(00D302FA) TTerminal::Open
(00C48A7B) TTerminalThread::TerminalOpenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(000672AC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00067279) ntdll.dll.RtlGetAppContainerNamedObjectPath

I know how to reproduce the problem or the problem happens frequently enough. I wish to be contacted by the WinSCP team to help resolving the problem.