When trying to connect SFTP over SSH, I got the following errormessage:
Fatal: unable to initialise SFTP: could not connect
[SOLUTION]
Verify that you can log on by SSH using the same credentials. It could either be a simply typo or the user you're trying to logon with is simply not allowed to.
Check the server's "/var/log/messages" for details, you might even find something like this:
User xxx from xxx not allowed because none of user's groups are listed in AllowGroups