Error: "Received SSH2_MSG_CHANNEL_DATA for nonexistent channel 0"

[isarrider]

Hi,

when using Dropbear together with this sftp server (and WinSCP),
I get after like transferring a few hundred Megabytes:

Can I help debug this somehow?
(Reference: ewxrjk/sftpserver#17)

[mkj]

I haven't seen that before - does it happen at the end of a transfer or session? Is it reliable to reproduce? If winscp has a debug log option that might give some clues. I agree with Richard Kettlewell - it looks like a bug in Dropbear or WinSCP.

I'll see if I can reproduce it here when I have time - what are the versions of Dropbear, WinSCP, sftpserver?

[isarrider]

it happens during the transfer session, with big files (~2GB usually more than 1x)...
For me it is really reliable to reproduce...
WinSCP does have a debug log - which level would you like?
(Cause the highest one really produces LARGE log files)
Version are the latest ones availible atm... (not the WinSCP beta, but the normal version...

[mkj]

Sorry missed your question about logs - any size would be OK, whatever's the largest you can upload!

[isarrider]

No worries...
Meanwhile there were some more tests:
MichaIng/DietPi#3296 (comment)
Ill take a look when I can do more tests