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From Tapas Mishra <>
Subject [users@httpd] invalid response from Proxy dns lookup failure
Date Mon, 10 Jan 2011 07:17:59 GMT
Ok here is a situation  today morning I had rebooted the server and I
observed and I see response for one of the application complaining

This is the error I see in browser

Proxy Error

The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /app1.

Reason: DNS lookup failure for:

Where as if I were to check only

then I can see every thing very properly without any error.

Here is my apache2 configuration

here is access log on the server which is front end (acts as reverse proxy)
and error log on reverse proxy server

and the server  where the application is actually hosted  I do not see
any log which can help me to understand that the request /app1
actually reached there.
How ever I tried to see the http headers in http_live
here they are

So what can this error be pointing to ?
Since until 2-3 days back every thing was working perfectly with same
settings and same configurations.
Today I had restarted server after many days just for maintenance and
after reboot
 I find all applications except the one which I pointed here working properly.

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