ORA-03136
inbound connection timed out
Cause
The inbound connection was timed out by the server because user authentication did not complete within the time specified by SQLNET.INBOUND_CONNECT_TIMEOUT or its default value.
Action
- Check the SQL*NET and RDBMS logs for traces of suspicious connections.
- Configure SQL*NET with a larger value for the SQLNET.INBOUND_CONNECT_TIMEOUT parameter, if necessary.