(EMERGENCY) ajp12: can not connect to host and ajp12: connection fail in Apache JServ mod_jserv.log

(Doc ID 603244.1)

Last updated on OCTOBER 04, 2016

Applies to:

Oracle Applications Technology Stack - Version 11.5.7 to 12.0.4 [Release 11.5 to 12.0]
Oracle Applications Technology Stack - Version 11.5.10.2 to 11.5.10.2 [Release 11.5.10]
Information in this document applies to any platform.
***Checked for relevance on 03-April-2013***

Symptoms

During peak load on the Web Server (EMERGENCY) messages are recorded in mod_jserv.log file. When trying to Telnet to the JServ port, the telnet session is not responding and waiting indefinitely though the port was listening and can be checked using netstat command. There are no error reported by End Users and Web Server is also working fine.

Emergency messages in mod_jserv.log:

[26/04/2008 22:31:34:875] (EMERGENCY) ajp12: can not connect to host 10.21.11.11:16503
[26/04/2008 22:31:35:037] (EMERGENCY) ajp12: can not connect to host 10.21.11.11:16503
[26/04/2008 22:31:35:875] (EMERGENCY) ajp12: can not connect to host 10.21.11.11:16503



Changes

Issue happens when there is heavy user load during peak hours.

Cause

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