Hello,

I have got an ASP.NET web site which enable anonymous
authentication.
When i try to hit this web site from machine X, it works.
When i try to hit the same site with machine Y, a windows
authentication pop up appears. So in this case, the
anonymous authentication fails.

Machine Y is in the same domain as the web server. Machine
X is in another domain.

I check everything about .net security (.config files,
NTFS, IIS). So if the problem was ASP.NET configuration,
this pop up should appear on both machines .. (?)

What are the reasons for anonymous authentication to fail ?

thanks,
john.