I'm not sure, but I believe I ran into the bug described in Metalink 361685.1 where the 9i listener refuses all connections to the auto-registered 8i DB after the first. Especially with an 8.0 DB, which can't auto-register, I would still be inclined to run multiple listeners. Then again, I'm paranoid that way. But I can be assured that I wouldn't run into any cross-version issues, especially given the support status of the older DBs listed. My $.02, Rich -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Wolfgang Breitling Sent: Wednesday, November 29, 2006 9:54 AM To: smishra_97@xxxxxxxxx Cc: oracle-l@xxxxxxxxxxxxx Subject: Re: Multiple Listener You can use the 10.2 listener to service all databases. Listeners are backward compatible. You only need to run 1 listener of the same version as your "highest" Oracle version database. At 08:23 AM 11/29/2006, Sanjay Mishra wrote: >I have three Oracle software in one server 8.06, 817 and 10.2.0.2 >and each one is having one instance running on the server. Do I need >to run three listener for all three Database separately on 3 >different Port or there is any way that I can use one Listener to >take care of all Client request. Regards Wolfgang Breitling Centrex Consulting Corporation www.centrexcc.com -- //www.freelists.org/webpage/oracle-l