IIS problems in SBS 2003

I am having a strange problem in my SBS 2003 server. None of my IIS apps seem to be working. This includes exchange and remote access. Exchange and everything else has always worked do this shouldn't be a dns issue considering nothing has changed.

Everything worked great and then today it all of the sudden went down.

So this is what I know:

If I go to https://localhost/remote I can login and everything seems to work.
Same thing for https://localip/remote
If I try to use my external ip or domain name it gives me "Internet Explorer cannot display the webpage"
This happens on the server on from an external source

Now if I type in https://localhost/exchange I get the login page but when i type in my credentials and hit enter it gives me "Internet Explorer cannot display the webpage" again
If I use my external ip or domain name it gives me "Internet Explorer cannot display the webpage" again

I have know idea what is going on or what to do.

i just need some help badly.

Thanks,
Tony