Making the Windchill URL public to access the same from Internet

Dear Members,

               Greetings of the day!!

    We have a task to public our Windchill URL to internet so that the remote users can also access the same when they are out of network.

Can someone help us out with the resolution.

Till now we have assigned one Static IP to the Windchill server but when we access Windchill through this the Apache asks for the credentials but after authentication the URL gets change to the Host name of the Windchill server ( e.g. http://host.mycompany.com:848/Windchill instead of 153.xx.xx.xxx/Windchill).

Please suggest the solution if anyone of you have faced the same issue earlier.

Your support will be appreciated.

Thanks