IIS doesn't work when machine is connected to the Internet

[grisha]

I have a home network and one of the machine "MAIN" is also connected to the IP. All the machines are WinXP.
When all the connections are on I can use MAIN ISS from the other machins of the home network, but not from the MAIN. MAIN says "The page cannot be displayed". Same problem with the other Web servers that I have on MAIN. When the Internet connection disabled IIS and other Web servers work properly on MAIN.
Please help.

 

[crashtestmac]

Do you have proxy enabled in any way....?

If you do you need to say bypass proxy for local addresses so that it is not trying to find your "main" machine on the web when it is on your lan.

Mac