Can't browse my page directly from IIS

[ddot02]

I dont know what did i change these days, just since few days ago i can no longer open (browse) my pages directly from my IIS 5.1

it also happens for main page (index.asp or index.htm) if i try to type "localhost" as the url in browser. Because
IIS always put 'localhost' as the default url if we browse the index page directly from the tree, so i checked if it could work by typing it in browser (

http://localhost),

but like i guessed... same... the page (my index.asp or index.htm) wont be open or i must wait forever.

But what make me curious is i can open it using

http://127.0.0.1.

As long as i know 127.0.0.1 is the "localhost" it self. what's wrong then?

Any one have any clue?

Thanks before everything

Heddy