Remote SQL Server 
The Messages user menu contains, among other things, the log of the X Server (remote SQL server log).
If network problems occur between an application server and the database computer, these problems and errors are stored in the X server log.
Procedure
Open the Database Assistant (transaction DB50) or the liveCache Assistant (transaction LC10). Choose 
Problem Analysis 
Messages Remote SQL Server 
.
or
Open the DBA Cockpit (transaction code DBACOCKPIT) and choose Diagnosis Messages Remote SQL Server .
Result
Check the log.