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I've configured Apache tomcat7 as backend & apache2.2 as frontend both on same CentOS 6 server & here is part of my configurations:
In Server.xml I have:

<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" connectionTimeout="600000" maxKeepAliveRequests="100" URIEncoding="UTF-8"/>

& in httpd.conf:

ProxyRequests Off
Timeout 600
ProxyTimeout 600
ProxyPass / ajp://localhost:8009/
ProxyPassReverse / ajp://localhost:8009/

The problem is that some servlets on my tomcat server takes about 3 minutes to complete, but after one minute the opened socket to server (no matter what client I use, whether browser or any other client application) is closed by server unexpectedly (anyway, servlet execution continues until the end, even after socket was closed).
In sysctl.conf I changed value for net.ipv4.tcp_fin_timeout to 600 and I'm sure that it's not an OS timeout problem, because when I access another time-consuming script without mod_proxy (e.g. a PHP script with 3 minutes execution time on same apache server), it works fine with all clients.
Any suggestion will be appreciated

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Try setting up connection timeout in Proxy directive like below

ProxyPass / ajp://localhost:8009/ connectiontimeout=600 timeout=600
ProxyPassReverse / ajp://localhost:8009/ 

I used these settings for my App and it was working fine

  • I've already tried it with no difference in the result! – Ehsan Khodarahmi Sep 25 '16 at 9:36

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