By default SSH access is disabled for FTP and web users which is a very good thing. I’d recommend enabling this only if you know exactly who’s connecting to your server and why.
In my case, I want to use my server to host Git repositories so I can collaborate with some trusted coding buddies of mine. Here’s how I did it – I’m using Plesk 11 for this demonstration:
Log into Plesk and head over to Websites and Domains
Next we’ll head over to Web Hosting Access
and in there you’ll find a drop-down menu which will allow you to grant access. You can even select the type of SSH access you’d like to give to your user:
And that’s all – no need to reboot the server, it just works.