1. Add jTDS driver.
2. Establish connection to the MS SQL Server using jTDS driver and then disconnect.
3. Rightclick jTDS driver and choose "Delete".
4. Try to reconnect.
Result: Error message appears, but it doesn't give a clue for the understanding the problem.
Created attachment 76049 [details]
Screenshot of an error message.
Reassigned to new owner.
Seems as a obsolete problem in recent builds.