OWA Problem

Hi I had OWA2003 and some time it do not work, when I type
http://servername/exchange or http://serverip/xchange I get Page cannot be
display, I tried restartting Exchange and IIS Services, but nothing.

And sometimes it started to work ok.

any ide?

What do you get if you just go to the base site?http://server or https://server

What do you get if you just go to the base site?
http://server or https://server