SFTP (SSH) has some options that may be useful. The most interesting one may be --ssh-operation-timeout
In the GUI, if I run"Test connection", I get a response in a fraction of a second. Does yours have much delay?
Key exchange is slow when size of group is more than 1024 bit (issue #304 and #130).
is a fix in 2016.1.0-beta4 of that. Duplicati’s last library update got it up to 2016.1.0-beta3, so it lacks that fix.
But before we go trying to manually update a library, it’d be good to know if you spot any slowness doing the “Test connection” or perhaps by watching the debug output if you try the Troubleshooting Steps I mentioned:
This will dump debug logs in real time to stdout on the console