Oracle Error Message
ORA-09763: osnmpx: send/receive error exchanging Mach ports.
Reason for the Error
The Mach driver failed to exchange port information with the other side of the connection. Either msg_send (sercose[0] == 1) or msg_receive (sercose[0] == 2) failed.
Solution
Check return code in sercerrno. Make sure both sides of the connection are still running.