A. A firewall is blocking the connection between WebLogic Server and the back-end database. This needs
to be immediately addressed with your network administrator

B. The response data provided by the database SQL is larger than the receive socket buffer, so you just
need to increase the buffer

C. The datasource connection was leaked and needs to be reset

D. The Oracle JDBC driver got corrupted and needs to be reinstalled or replaces with a different driver

E. The maximum capacity of the connection pool was reached due to higher load than usual and you just
need to wait until new connections get released or increase the capacity of the pool. This can be done
in the Admin Console.

F. The activity on the database side needs to be checked with your DBA to verify if the connection
request was received and how it's been handled by the database