Exchange 5.5 OWA errors

I recently had to reinstall the entire exhcange 5.5 sever. It all works fine, except OWA. I have tried multiple things including what is on technet, but nothing is working. Before the reinstall I had the default document set to logon.asp and it worked fine. Now if I leave it as default.htm or default.asp, it gives not auth to see the page. If I change it to logon.asp, gives 404 file not found. Tried reinstalling only OWA three times. Even tried restoring from backup pre-reinstall. All the property settings seem fine. Help Please!