Hi, You can increase default value 60sec for SQLNET.INBOUND_CONNECT_TIMEOUT in sqlnet.ora file on server Regards, Pawel Dnia 2011-02-23, śro o godzinie 19:54 +0530, KRISHNA MOORTHY pisze: Hi We are getting frequently the following error in alert log files of production server.It was running fine for last 3 months.There is no changes in listener configuration. WARNING: inbound connection timed out (ORA-3136) In Sqlnet.log file the following error is getting displayed. TNS-12535: TNS:operation timed out nt main err code: 0 nt secondary err code: 0 nt secondary err code: 0 nt OS err code: 0 nt OS err code: 0 ns secondary err code: 12606 nt main err code: 0 nt secondary err code: 0 nt OS err code: 0 TNS-12535: TNS:operation timed out ns secondary err code: 12606 nt main err code: 0 nt secondary err code: 0 nt OS err code: 0 TNS-12535: TNS:operation timed out ns secondary err code: 12606 nt main err code: 0 nt secondary err code: 0 nt OS err code: 0 When i searched on the net,they are telling that it might be an network issue.But when i asked the network team , they said there is no firewall /port block issues.Please help me to resolve the issues. Regards Krishna 9585354917 -- //www.freelists.org/webpage/oracle-l Nordea Bank Polska S.A. z siedzibą w Gdyni, ul. Kielecka 2, 81-303 Gdynia, wpisaną do Rejestru Przedsiębiorców Krajowego Rejestru Sądowego pod numerem: 0000021828, dla której dokumentację przechowuje Sąd Rejonowy Gdańsk - Północ w Gdańsku, VIII Wydział Gospodarczy Krajowego Rejestru Sądowego, o kapitale zakładowym i wpłaconym w wysokości: 277.493.500,00 złotych, NIP: 586-000-78-20, REGON: 190024711