When I'm trying to get here:
all I get is the following error: "This website requires you to log in" ..but I'm logged in as Administrator. (and I can get to a specific location e.g. http://someName.com/_vti_bin/PSI/Project.asmx?wsdl)
The problem is that my WebPart, because of that situation, cannot access any PWA WebService.
I think that the issue is related to the server configuration because it doesn't work only on production server - on dev it works fine.