SendBuf=0 Not Doing Its Job?

For some reason, the site I connect to doesn't work well with the "Optimize connection buffer size" enabled, and whenever I had that on while downloading files larger than a few megabytes, I'd get this error:

Server unexpectedly closed network connection.

Fortunately, I found how to turn it off and (in the GUI version at least) all my transfers are successful. On the contrary, in batch mode from a script file, even after setting -rawsettings SendBuf=0 appended to the open command, the connection will "unexpectedly close" on files larger than a few megabytes.

Does SendBuf=0 completely turn off the feature as the GUI checkbox does?

Thank you.

Yes it does.

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

I attached the log files and have reproduced the problem again. Thank you.

OK, I was wrong. Try also setting SshSimple=0

Thank you. That works.

Hey,

I'm trying to rename files in a SFTP and it works, but after a few files renamed, suddenly the below text is written in the log and the exception is never thrown.
. 2016-01-28 12:46:06.719 --------------------------------------------------------------------------
. 2016-01-28 12:46:06.719 Looking up host "sftp.cleanharbors.com"
. 2016-01-28 12:46:06.719 Connecting to 12.15.160.40 port 22
. 2016-01-28 12:46:06.938 Server unexpectedly closed network connection
. 2016-01-28 12:46:06.938 Knocking FTP port.
. 2016-01-28 12:46:07.079 FTP port opened, will suggest using FTP protocol.

I already set SendBuf=0 and SshSimple=0
I'm using C#
sessionOptions.AddRawSettings("SendBuf", "0");
sessionOptions.AddRawSettings("SshSimple", "0");

Any thoughts?

Thanks.

RVidarte wrote:

I'm trying to rename files in a SFTP and it works, but after a few files renamed, suddenly the below text is written in the log and the exception is never thrown.
. 2016-01-28 12:46:06.719 --------------------------------------------------------------------------
. 2016-01-28 12:46:06.719 Looking up host "sftp.cleanharbors.com"
. 2016-01-28 12:46:06.719 Connecting to 12.15.160.40 port 22
. 2016-01-28 12:46:06.938 Server unexpectedly closed network connection
. 2016-01-28 12:46:06.938 Knocking FTP port.
. 2016-01-28 12:46:07.079 FTP port opened, will suggest using FTP protocol.

I already set SendBuf=0 and SshSimple=0
I'm using C#
sessionOptions.AddRawSettings("SendBuf", "0");
sessionOptions.AddRawSettings("SshSimple", "0");

That piece of log is hardly related to file renaming.
Please start a new thread and attach a complete log. The options SendBuf and SshSimple are absolutely not related to this problem either.

Hello,

I have the same problem.
-rawsettings SendBuf=0 SshSimple=0 don't help

Interesting is that after many attempts finally the file is uploaded successfully.
Please see log file.

Can I have a test account on your server?