Proxy Error in application page

Hi
when i entered the url it shows error https://domain.com/OA_HTML/AppsLocalLogin.jsp
Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /OA_HTML/AppsLocalLogin.jsp.
Max-Forwards has reached zero - proxy loop?
Apache/2.0.52 (Red Hat) Server at domain.com Port 80
Regards

this is an oracle EBS/ apps question, not a linux question.
the apache is configured to contact jserv, and it is not supported to use another webserver than the oracle http server. unless your redhat apache webserver is configured to function as an proxy before the oracle http server, which proxy's to jserv for the jsp's.
troubleshoot every distinct process on itself first (is it working? does it accept communication), then try to follow the logical connection between them, and use the logfiles, or logfiles with enhanced verbosity to troubleshoot.
in a nutshell: you did give way to little information to be able to help you.

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