SFTP server log entries - An existing connection was forcibly closed by the remote host

Question

I'm testing your demo trial of the .Net SFTP library for CF 2.0 (RebexSftp-2016R1.1)

The sample runs fine, and i can log in a SFTP server, upload/download files, etc... but all the time that i disconnect the client i get an entry on the log server: 'An existing connection was forcibly closed by the remote host'.

I'm using your Rebex tiny SFTP server, but i already tried with other servers and the behaviour is the same.

Using another SFTP client (for instance FileZilla) i don't get the warning entry on the server and i get a graceful disconnect.

Comments

Thank you for your bug report. I was able to reproduce the error with both the .NETCF 2.0 and 3.5 version of Rebex SFTP client components. We are looking for the solution, I will keep you updated about the progress and send you the solution hopefully by tommorow.

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I have more information - the bug is actually caused by a bug in .NET Compact Framework which reports that a packet was already sent, althouhg it actually was not. This results in our client closing the connection as it thought that the gracefull connection close request has already been sent, altough it was not.

We already came across this issue before in our FTP client component. Fortunatelly, adding a workaround is simple. We only have to wait for a small amount of time in the Disconnect method after we send the packet before closing the connection. I will send you a hotfix tommorow.

Answer 1

This has been solved in Rebex SFTP 2016 R2.

As promised I've prepared the hotfix. Please download the SFTP fixed trial version, and give it a try.

Comments

Hi Tomas,

I've done a few tests and now it seems to be working properly.
Thanks a lot for the effort and fast reply.

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Hi jb, you're welcome! It's nice to hear that it's working now.