I have installed OMV on a Raspian Jessie installation using apt-get. The installation works just fine, OMV starts and I can access the WebUI with not problems. I have activated the SSH service but when I try to connect I get 'Permission denied' for all user accounts. I am, however, able to login using the same accounts when I connect locally with a keyboard and monitor... 
What could be the cause and solution to this?
br
Henrik