R12 Login issue on target after cloning , fresh install or upgrade

Successfully installed R12.1.1 in my linux box without giving any error. But when I have access my login through IE 7, http://hostname.domainname:port getting message "unable to autheticate the session" instead of giving me username and password screen. So I have thought of Firefox, using URL : http://host.domain:port is redirected to http://host.domain:port/OA_HTML/AppsLocalLogin.jsp
nothing happen , no error, ...

The cause of the issue may be Jsp / Class corruption under $COMMON_TOP/_pages,  because of that system was not able to access the classes this may have as root cause jsp / class corruption or wrong $CLASSPATH

After running the following steps, the issue has been resolved and I can able to login successfully.

1. cd $FND_TOP/patch/115/bin
2. perl ojspCompile.pl --compile --flush -p 2
3. Run autoconfig on both db and apps tiers
3. Bring up the services and test login

Cheers!!!

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