I have setup a geodatabase on SQL Server 2014 and then installed ArcMap 10.4.1 on a client PC. The ArcMap can open the feature classes and tables on SQL Server, but once the PC screen is locked, after unlock, the ArcMap prompts communication link error but the connection between PC and SQL Server is normal. Anyone have ideas?
Did you install the correct SQL Server client, The Microsoft ODBC Driver 13?
Can you check to see if there is a timeout on the network? Sometimes networks have a timeout after a certain time frame with out any communication on the port.
Does this error happen after you leave the PC locked for a certain amount of time?
Geodatabase