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=).


**************** CAUTION - Disclaimer *****************
This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended solely for the use of the addressee(s). If you are not the intended recipient, please notify the sender by e-mail and delete the original message. Further, you are not to copy, disclose, or distribute this e-mail or its contents to any other person and any such actions are unlawful. This e-mail may contain viruses. Infosys has taken every reasonable precaution to minimize this risk, but is not liable for any damage you may sustain as a result of any virus in this e-mail. You should carry out your own virus checks before opening the e-mail or attachment. Infosys reserves the right to monitor and review the content of all messages sent to or from this e-mail address. Messages sent to or from this e-mail address may be stored on the Infosys e-mail system.
***INFOSYS******** End of Disclaimer ********INFOSYS***
--