I am getting this error when trying to log into our service desk.

"Unable to connect to the directory server. Please contact the Administrator."

I found an article about checking address restrictions on users, but it did not apply as there we're no address restrictions. This error happens with all of my users.

Some basic stuff I tried, restarting the server and restarting SQL services on the SQL server.

We're running the latest Service Desk on Windows server 2012 and connected to SQL 2012.

Just thought i'd check here before opening an SR. Thanks.