IP Address is Working,But server Name is not Working

Hi! All,

i am facing a very strange problem.

I have developed a WebDynpro application and it's running fine But when i am looking that application in Portal by giving serverName instead of IP Address, it's giving me page can't be displayed,But when i put the IP Address, i am able to see the Deployed application in portal.

one of the solution may be to make an entry in Host.ini file but a lots of user is using this application and i can't say all of them to make such entry.

can anybody suggest any idea to get an acceptable solution??

Thanks,

Mithileshwar