Question : Some users get IIS 500 errors when logging onto Sharepoint Team Site

I'm running a Windows Sharepoint Services (v2) Team site under Windows 2003 Server (standard), using IIS6 and MSSQL 2000.

I can access the site fine from my laptop as can my work collegues.  It also works from my home PC, in IE5, 5.5 and 6 + FireFox 1.0.

However, people browsing from two separate locked down corporate networks always get IIS 500 error pages when they try to login to the site.  The username/password used in all cases is the same.

I'm looking for some pointers on where I should start looking for the cause of this problem.

Thanks

Answer : Some users get IIS 500 errors when logging onto Sharepoint Team Site

Integrated authentication pulls the credentials of the currently logged on user and authenticates them against the server's domain and any domains it trusts.   If authentication fails, a logon box will popup. Credentials must be entered in this box in the format:
domainname\username
password

If your users are in a different domain, you need to setup a trust so that at a minimum the server's domain TRUSTS the user's domain.  If this trust is not in place, integrated authentication will fail.

If you turn off integrated authentication do you still get the "function requested is not supported" error?
If the error disappears, as indicated in my last post, your error may be a flow-on effect of your authentication issues... i.e. Frontpage is erroring because it can't authenticate the user properly.