Accessing Microsoft Dynamics Nav 2013 WebClient using IP Address

I am able to access Microsoft Dynamics Nav 2013 WebClient  using http://servername:8080. But if i try to access the same using IP , ie. http://x.x.x.x:8080 , it is asking for authentication and displays the following msg:

A server error has occurred, and the content cannot be displayed. Refresh the page or open a new browser window.

Fyi, the Dynamics NAV Database Server and Dynamics NAV WebClient are running in different physical computers. 

Please help to resolve this issue...