Sharepoint active directory credentials popup

When accessing a sharepoint site on our intranet some users see a popup box asking them to enter their credentials.  When they enter credentials the box reappears.  After several attempts they will see an error 410- unauthorized access.

In our environment we have two domains, say Lemon and Peach.    Users in the Peach domain can always access sharepoint OK.  Users in  the Lemon domain can only access sharepoint from a Lemon domain PC.  eg

                    User domain
                 Lemon    Peach
PC domain
Lemon           OK       OK    
Peach             Fail     OK

Can anyone give some clues about how to solve this?


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chinguettiAuthor Commented:
I solved the problem.  We needed a GPO to change the NTLM protocol on the Lemon domain.

This was the GPO;

Computer Configuration\Windows\Settings\Security Settings\Local Policies\Security Options, and set the Network security: LAN Manager authentication level field to Send NTLMv2 response only/refuse LM & NTLM.

This was the relevant registry setting affected on the client;

Walter CurtisSharePoint AEDCommented:
A few points to consider:

SharePoint was probably installed in and is a part of the Peach domain. So when a user logs in it is assumed the user is a part of the Peach domain. If a user from the Lemon domain attempts to log in with telling SharePoint they are a Lemon user, they receive the behavior you describe ending in a 401 error. Users from the Lemon domain will have to log in using this format: Lemon\UserName, then their password.

Of course, there needs to be a domain trust between the domains for this to work.

Hope that helps...
Walter CurtisSharePoint AEDCommented:
Glad you got it fixed.
chinguettiAuthor Commented:
I want to help others who have the same issues.  My solution was the best.
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