I was trying to have some IE from one PC to the other after some GP were applied.
Clcik Run... and type gpedit.msc. Then here is the path: Right click on Internet explorer Maintenence and click export. Then on the other machine just double click it.
I was accessing a site from a client without a problem. Even the authentication whould have pick up the windows credentials and so it would be an automatic login without having to specifically type the credentials. As it should be!
Now, the same site in the server that hosts it would not only asked me authentication but as well would not allow access after credentials have been given.
If the ASP.NET is not listed in yor web server extensions folder in the IIS, you need to manually install it and enable it. Please follow this steps. Though it is in the documentation of WSS 2.0, it perfectly apply on the WSS 3.0 as well:
If you are experiencing any problems with IE or with sites (when before you didn't have this problem), just reset IE settings. This deletes all the cookies, ActiveX, passwords, browsing history, etc. Actually it turn IE to be what it was when you first turned it on.