Weblogic Trouble Shooting issues(Application /URL is not working)

Trouble shoot issue for Application down:

When any of ur client comes up saying Application is not working need to access the Application URL from our side.

 If we get the following errors in accessing application.

•  Page can’t display error.

• Blank Page error.

• Redirection error: If the application is move to another a server

• 503 error

• If file is not found in app server then we get 404 error pages.

• 403 if user is not authorized person(forbidden)

• NSAPI (back end not available)

• Network (TCP/IP) error.

• Packets lost error: Packets are lost while data being transferred from one server.

• Intermittent failure of application.

• Access logs,Error logs (web Server-Apache/Tomcat/IIS)

• Access logs (app server weblogic/Jboss/Websphere)

• Need to disable the option show friendly urls in the internet explorer.

• Ping can be used to check the response is coming from application server.

• Connection between the app and database server can be checked by finding out the connection pool status.

• Need to test web logic server instance.

• Access log of web agent need to be checked.

• App server log should be checked whether backend server available or not.

• Check the command given by Tim to check the connection between web server and app server.

• Web logic admin utility to test connection between web and app server of Weblogic.Admin.

Need  to  Checked.