New Connections Intermittently Rejected with TNS-12525
Last updated on AUGUST 24, 2017
Applies to:Oracle Net Services - Version 10.2.0.1 to 126.96.36.199 [Release 10.2 to 11.2]
Oracle Net Services - Version 188.8.131.52 to 184.108.40.206 [Release 12.1]
Information in this document applies to any platform.
***Checked for relevance on 20-DEC-2013***
At regular intervals (every three hours), you see new connections rejected with TNS-12525 "listener has not received client's request in time allowed".
The listener log shows the following error stack :
10-APR-2008 17:39:15 * <unknown connect data> * (ADDRESS=(PROTOCOL=tcp)(HOST=XX.XXX.XXXX)(PORT=4184)) * establish * <unknown sid> * 12525
TNS-12525: TNS:listener has not received client's request in time allowed
TNS-12535: TNS:operation timed out
TNS-12606: TNS: Application timeout occurred
At the same time the firewall log reports :
"TCP packet out of state: First packet isn't SYN; tcp_flags: PUSH-ACK"
Wireshark (Ethereal) traces show the TCP 3-way handshake never completes for those connections.
Value of idle timer was recently changed at firewall level.
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