Apache closes AJP idle AJP/1.3 connections but connections to Tomcat server. However, for some reasonreasons, these connection these close connection requests do not close Tomcat connections. As a result, at Apache end, we have 0 AJP connections but at the Tomcat side, we have to many established AJP connections emanating from the Apache. This is "half-closed TCP connection" problem. This issue is mostly faced when there are wrongly configured Firewall rules.
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result in closing and clearing of corresponding connections at the Tomcat server end. As a result, over a period of time, there will be too many open connections at the Tomcat server end resulting in queuing/rejection of new connection requests from the Apache server. This issue is mostly because of incorrect firewall rules.
The manifestation of this issue is OpenSpecimen UI/API become unresponsive.
To resolve this issue, please follow below steps:
1. Edit $TOMCAT_HOME/conf/server.xml and search for below line:
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<Connector port="8009" protocol="AJP/1.3" redirectPort="8443"/> |
2. Add ConnectionTimout Connector attribute to the above line attribute as shown below. This will ensure the AJP connections at Tomcat end are closed after 5 minutes of continuous idleness.
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eg. <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" connectionTimeout="300000"/> |
3. Save and exit the server configuration file.
4. Restart Tomcat serviceserver.