I finally managed to get the website up and running. But still it does not work correctly.

Everything works fine when browse through localhost (http://localhost/appname/userlogin.aspx)

But when i browse the website using the machine name(http://servername/appname/userlogin.aspx) it directs me to the login page. I get authenticated and redirected to the default page. The menu links does not work any more. I do not get any error . 

 Please help me troubleshoot the problem.

Thanks much.