Error while logging into SFTP

[flarf]

I'm getting the following when trying to login via SFTP:

$ sftp user@domain.com
Connecting to domain.com...
user@domain.com's password:
Received message too long 1399350636

Andrew's response to this was that the use of SFTP was not supported, however a search on the forums leads me to believe that it is possible.

I've installed a self-signed SSL certificate for this domain..

Any ideas?

[flarf]

Solution: SSH wasn't enabled for the account.