SFTP connection will stall after a long idle

[cyberduck]

689b6be created the issue

I've noticed recently (after upgrading to the latest version and also in 3.4.2 - I had been using an old old one 3.1 I think...), that if I leave an SFTP window open for a period of time (I would guess about an hour), and then I try to perform any action, Cyberduck will show the "spinner" at the bottom of the window, but nothing happens. Not even a time out.

I have the following in my ~/.ssh/config file - which used to be enough to stop this problem:

ServerAliveInterval 120
ServerAliveCountMax 10
TCPKeepAlive yes

Do newer version of CyberDuck ignore what is present in this file? I've tried version combinations of the commands in the file, and also have a file named ~/.ssh/ssh_config (which some sites suggest it should be), but to no avail.

[cyberduck]

@dkocher commented

The timeout settings are not read from .ssh/config but can be set in the Connection Preferences. However, there must be an issue with stalled SSH connections as noted previously in #3941 and #4214.

[cyberduck]

@dkocher commented

Replying to [5073 theallan]:

Refer to OpenSSH Configuration Interoperability for a list of settings that are read from the OpenSSH configuration file.

[cyberduck]

689b6be commented

I've got a time out setting of 30 seconds (as per default), but the connection "hangs" for a lot longer than that. The "spinner" in the window will simply keep going, as far as I can tell indefinitely (certainly for 10+ minutes).

Regarding the other two bugs, it does sound very similar. Is there a way to stop the session from going stale, and thus working around these issues? It never used to be a problem, but is since I did an upgrade.

[cyberduck]

@dkocher commented

In 356476b.