On the Connection screen, connect to the SQL Server. Do not put the double quotes and target system name should be YOUR target system name, which is the one that is failing. Try to do a describe. Fill every thing in. From Server Source System Menu, select Option 10 - Describe Source Tables to Target System.
Press enter and wait to see if it completes normally.
Once complete, go to your NT press F5 for a refresh and the Target should be gone. Target system does not exist or there was a database error while retrieving target information. No target systems started or ended. There should not be any DataMirror processes running Perform a Describe top 7. After logging into EA you get an error stating the username and password do not match the ones stored in the registry.