Topic "Cannot connect using Explicit SSL/TLS"

Author Message
matej sk
[View user's profile]

Joined: 2014-01-21
Posts: 3
Hello,

I am having trouble connecting to a FTPS server using WinSCP 5.5.1 (Build 3970), with Explicit TLS/SSL. I have tried all options of the min+max SSL/TLS version setting. The connection goes like this:

Code:
220-FileZilla Server version 0.9.41 beta
220-written by Tim Kosse (Tim.Kosse@gmx.de)
220 Please visit http://sourceforge.net/projects/filezilla/
AUTH TLS
234 Using authentication type TLS
(now client sends packet with content X to server)
(client waits for 15 seconds default)
(client sends packet with content Y to server, immediately closes TCP by FIN+ACK)


According to my wireshark debugging:
    X concat Y = Client Hello
    X ends with character hex 0x0A

I *think* the trouble here is that WinSCP incorrectly sends only part of the SSL/TLS Client Hello when it sees the supposedly-end-of-line character.

Do you need any more info?

Thank you for your help.

Edit: Running on Windows 7 Enterprise SP1, 32-bit.
Attached sample packet dump, IP addresses have been anonymized.
Reproducible always.
winscp-tlstimeout.anonymized.cap.gz (1.8 KB) [Download]

Description: TLS client timeout packet dump (gzipped due to forum restrictions)

martin
[View user's profile]
Site Admin
Joined: 2002-12-10
Posts: 24512
Location: Prague, Czechia
Thanks for your report.
I have sent you an email with a debug version of WinSCP to address you have used to register on this forum.
matej sk
[View user's profile]

Joined: 2014-01-21
Posts: 3
matej sk wrote:
I *think* the trouble here is that WinSCP incorrectly sends only part of the SSL/TLS Client Hello when it sees the supposedly-end-of-line character.


Sorry for the report and thank you for your time helping on e-mail.
The packet splitting at the 0x0A character seems to have been caused by my VMware Player with NAT mode networking.
The bug is not in the WinSCP client.
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