ORA-28547 - "connection to server failed, probable Oracle Net admin error" when Database sessions touched 18,000

Folks



During a Benchmark Run as Number of Database sessions increased to 18000 
following Error Occured:-

ORA-28547 "connection to server failed, probable Oracle Net admin error"



Qs Will increasing the Number of Listener processes help?

ACTION - Listener processes have been increased from 12 to 16. But need to 
check if the error re-occurs or is resolved.



Qs Could it be a Network bandwidth issue?

Currently all 16 Listener processes sit on the SAME ( 1 ) Network Card, but use 
different Port Numbers.



Database setup - Shared Server (MTS)

Oracle 10.2.0.3 (NON-RAC)

Solaris 10



Will share any info needed.



Cheers



P.S.

$ oerr ora 28547:-

*Action:  Check Oracle Net administration in the following ways:
//           --  When using TNSNAMES.ORA or an Oracle Names server, make sure
//               that the client connection to the ORACLE server uses
//               the correct service name or SID.
//           --  Check LISTENER.ORA on the connection end point's host machine
//               to assure that this service name or SID refers
//               to the correct server.
//           --  Confirm in TNSNAMES.ORA or the equivalent service definition
//               that the connect string does NOT contain (HS=).

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