Host is not communicating for 15 seconds

I'm using VisualBasic .NET to write a patching application. WinSCP version is 5.5.2 Build 4130. Code running on Windows 7 64-bit. Code sends a command from Windows to Linux for a patching program to run on Linux and waits for job completion. Patch apply/download time may be greater than 15 seconds. If it is, code aborts due to timeout. I've tried sendbuf = 0, sendbuf = 262144, .Timeout = 2 hr value. I still get timeouts after 15 seconds of inactivity while waiting for patch or downloads to happen and my process abends. Help ... here's the code:

Dim SessionOptions As New SessionOptions ' SCP configuration options
Dim Session As Session = New Session ' Linux connection config options
Dim Timer As New TimeSpan(2, 0, 0) ' Session Timeout interval setting: 2 hr, 0 min, 0 sec

With SessionOptions ' Set up session options
.AddRawSettings("PingType", "2") ' Send execute dummy protocol cmnds
.AddRawSettings("SendBuf", "0") ' Optimize connect buffer size
.AddRawSettings("SshProt", "3") ' Preferred SSH version: SSH-2 only
.AddRawSettings("Shell", "bash") ' SCP protocol: "bash"
.GiveUpSecurityAndAcceptAnySshHostKey = True ' Accept any SSH host key
.HostName = Buf(2) ' Hostname's IP address is in var
.Password = Pwd ' Provide decrypted password
.PortNumber = 22 ' Assign SSH channel 22
.Protocol = WinSCP.Protocol.Scp ' Assign SCP protocol
.UserName = ProxyUsr ' Provide username
End With ' SessionOptions

With Session ' Execute statements
.DisableVersionCheck = False ' Don't check lib against DLL
.DebugLogPath = Path & "Debug\" & Buf(1) & ".log" ' Set session debug path
.ExecutablePath = Path1 & "WinSCP.exe" ' Set path to SCP program
.IniFilePath = Path1 & "WinSCP.ini" ' Set path to INI file
.SessionLogPath = Path & "Session\" & Buf(1) & ".log" ' Set session transaction log path
.Timeout = Timer ' Set session timeout to two hours
.Open(SessionOptions) ' Call Linux through SCP
Cmd = "./update.sh" ' Command to execute
Str = (.ExecuteCommand(Cmd).Output).Replace(Chr(10), Chr(13) & Chr(10)) ' Linux/VAX execute
OutFile.WriteLine(Str) ' Dump exec returned text to file
Console.WriteLine(Str) ' Dump exec text returned to screen
End With ' Session

I am now testing with rawsetting PingType = 1

Using SessionOptions.Timeout is the right way.

Please attach a full session log file showing the problem (using the latest version of WinSCP).

Attached is the log file

OK, as I wrote before, you need to use SessionOptions.Timeout. You are setting Session.Timeout.

Just saw that in the code ... switching and retrying. Will get back on issue with VAX after I resolve this one ... stand by

I think I see my confusion. In Session Properties, it says "Maximal interval between two consecutive outputs from WinSCP console session, before TimeoutException is thrown. The default is one minute." In SessionOptions Properties, it says "Server response timeout. Defaults to 15 seconds." I'm now using it in both Session and SessionOptions just in case.

rgaetan wrote:

I think I see my confusion. In Session Properties, it says "Maximal interval between two consecutive outputs from WinSCP console session, before TimeoutException is thrown. The default is one minute." In SessionOptions Properties, it says "Server response timeout. Defaults to 15 seconds." I'm now using it in both Session and SessionOptions just in case.

I have updated documentation of Session.Timeout to make it clear, one should hardly ever want to set it.
https://winscp.net/eng/docs/library_session