HTTP Error 401.1 - Unauthorized: Access

Hi

Any one can help me to get rid for the following error message - HTTP Error
401.1 - Unauthorized: Access

I am explain the setup first

Server1: Windows 2000 SP4 - Domain Controller with Active directory the
Domain Name is ABC
Server2: Windows 2003 SP1 - Microsoft Dynamics - With Named SQL Server
Server3: Windows 2003 SP1 - IIS, Windows Share Point Server, Business Portal

The entire servers are added to domain ABC.

In the domain we are having following user

User1 - Domain User
User2 - Domain User

We installed the BP in the server 3 logged in as ABC\Administrator. We
followed the BusinessPortalInstallation.pdf document. While installing the
BP we uncheck the option use enhance security for administration pages in
web site configuration (refer the Step 9 page 43
BusinessPortalInstallation.pdf). While Installation we added sample user
also.

After the successful installation we added the domain users, user1 and user2
thru Site Settings => Mange Portal User.

User1 was assigned as site administrator and user2 as employee user.

I can able access the web site in the server 3

Now the problem is I can't able to access web site as a any domain user from
any client or server even though we followed the client setup procedure in
the chapter 14 in BusinessPortalInstallation.pdf

Assume that I logged in the Server2 as domain administrator as
ABC\Administrator. Which is the same user installed the BP in server3. Now I
give the URL in IE It is prompting for the username password with prompting
windows as connecting to Server3.ABC.com we had given the user id as
ABC\Administrator and password which is prompted for 3 times and throw this
following message

You do not have permission to view this directory or page using the
credentials that you supplied. HTTP Error 401.1 - Unauthorized: Access is
denied due to invalid credentials. Internet Information Services (IIS)"

Also it is not allowing any domain users (User1 and User2) it is giving the
same error message

But I can able to access the web site from server2 as any Sample User which
was created in the installation. It seems that the user are locally
available in the server3 is allowed to access from any PC to confirm this we
created the user3 in the serever3 (not in the server1 domain) and we added
this user in the site settings=>Mange Portal User as site administrator
user.

Now from the Server2 we try to access the web site when it is prompting for
the userid we given as Server3\user3 and the respective password then the
site is loading I can go to all the web pages but form here as portal
administrator if we try to add or delete any user it is giving the script
error message.

From this we clearly understand that the IIS in server3 is not allowing
accessing any domain user to access the web site. So will you please help us
to how can we fix this problem

Please reply at the earliest

Regards
Nizham