FTPS Keep Alive to Control Port for Large File Transfers

schultkl · Post by **schultkl** » Tue Nov 12, 2013 7:33 am

It seems Core FTP LE only sends Keep Alive commands to the control port when idle, not when downloading large files...can someone please confirm?

On SmartFTP and FileZilla, it appears they allow sending Keep Alive commands to the control port when downloading a large file via the data port.

We use Core FTP LE build 1785 to download large files (~7GB). We get intermittent connectivity errors even though we use passive and have the Keep Alive checked black. The logging pane does not seem to show any commands getting sent to control port (e.g., LIST, NOOP, CWD). When the transfer fails, we begin seeing the Keep Alive commands in the logging pane.

Thank you.

Post by **ForumAdmin** » Tue Nov 12, 2013 7:13 pm

This might be caused by the socket level keep-alive not being set. It will be fixed in build 1791 and greater.

schultkl · Post by **schultkl** » Thu Nov 14, 2013 4:18 am

[quote="ForumAdmin"]This might be caused by the socket level keep-alive not being set. It will be fixed in build 1791 and greater.[/quote]

Thank you; I will follow-up after the release of build 1791.