NTLM Authentication on IIS 6.0

I have an Intranet site set up on IIS 6.0 and have an intermitten
problem. A couple of areas on the Intranet are restricted. We have
Windows Intergrated Authentication enabled on the couple of pages that
require access. I have a security group set up with only the users who
require access and the group has full control. No other account has
access. The problem happens to everyone in the security group.
Sometimes a user can go for two weeks without being prompted for
username/password and sometimes it happens two or three times a day.
When I click the link and am prompted, I use my userid/password and
authentacation fails. I use the administrator un/pw and that fails.
Other users use their logons and fails also. Now everytime I am
prompted and use the local administrator username/password for that
server, it works everytime. I know that NtAuthenticationProviders is
set to Negotiate,NTLM since that is supposed to be the default, and I
never changed it. The following is logged to the security log when
unable to access the intranet page:
11/7/2006 4:32:35 PM Security Failure Audit Account Logon 680 NT
AUTHORITY\SYSTEM FEC-2KNT4 "Logon attempt
by: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
Logon account: administrator
Source Workstation: IT_OPERATOR
Error Code: 0xC000006A

The 529 event it also will show up but that is the usual logon failure
I often see returned for all kinds of authentacition problems.

I can't seem to be able to figure out what I have configured wrong and
why it is intermitten. If it failed every single time this wouldn't
seem as strange to me. Any suggestions would be greatly appreciated.

Thanks!

Rick

.

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