Cause
A connection request was refused by a dispatcher because the dispatcher cannot support any more connections.
A connection request was refused by a dispatcher because the dispatcher cannot support any more connections.
Connect to a different dispatcher, or use a dedicated server.
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e0.htm
http://docs.oracle.com/cd/E16655_01/timesten.121/e21636/awt_trouble.htm
https://community.oracle.com/message/1216350
https://community.oracle.com/message/1228927
Browse all solutions to database errors from Oracle, MS SQL, or MySQL