Tuesday, July 14, 2015

Connection timed out: proxy: HTTP: attempt to connect to

Following error is displayed when you are trying to configure proxy balancer cluster by adding the back end servers as cluster members in apache.

[error] (110)Connection timed out: proxy: HTTP: attempt to connect to hostname:portname (nodename) failed
[error] ap_proxy_connect_backend disabling worker for (nodename)
[error] proxy: BALANCER: (balancer://). All workers are in error state
[error] (110)Connection timed out: proxy: HTTP: attempt to connect to hostname:portname (nodename) failed


Trouble shooting steps:

-> Since the error says connection timed out, either the port is not listening or it is blocked at firewall end.

-> do a telenet to the backend host that you have added as balancer member from your webserver host.

telnet hostname portname

-> If you are unable to telnet, Then you have to get the port open from webserver to application server at firewall level.

-> If the telnet is successful, Then the tomcat or the backend should be down (or not running). Need to check access logs for further troubleshooting.

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