IIS 6 - Windows Authentication to a trusted domain fails

I am in the process of deploying sharepoint in an extranet environment.
All external users have an account created on the extranet server (Domain B) and are able to authenticate.

All internal users have accounts on a seperate server (Domain A). I have setup a one-way trust between Domain A and Domain B.

I have added a group on Domain B called "Internal Accounts" and successfully added users from Domain A.

Within the sharepoint portal I have granted "Reader" access to the "Internal Accounts" group.

When an internal user attempts to login, they receive an internal 500 error.
Error Code: -1073740781 (0xc0000413) - Login Failure

If I attempt to login using an account that doesn't exist, I receive an authentication error.
Since I am receiving an Internal 500 error for the problem above, I would assume that Sharepoint does recognize that the user exists, but cannot process some information.

Could this have something to do with the way that Sharepoint impersonates user accounts. Is it possible that even though I have setup the trust, that the impersonated account does not have permission to Domain A's active directory.

Does anyone know if this is a Windows issue I am having or Sharepoint issue?

Many thanks!
mmcleod1Asked:
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Dave_DietzConnect With a Mentor Commented:
Sounds like you may actually have a Forest trust rather than a domain trust:

To select the scope of authentication for users authenticating through a forest trust, click the forest trust that you want to administer, and then click Properties. On the Authentication tab, click either Forest-wide authentication or Selective authentication.

With Selective authentication there is additional configuration that needs to take place.

I would suggest using Forest-wide authentication in this case.

See if it helps....  :)

Dave Dietz
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mmcleod1Author Commented:
Dave, thanks for the suggestion.

Under the Authentication tab, I have an option for Domain-Wide authentication or selective authentication.  (Not Forest-wide authentication)

The trust setup is: domainA.mycompany.net
I have tried adding the trust: mycompany.net and receive the same results.

Any other thoughts?
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mmcleod1Author Commented:
Well it seems to be working this morning so maybe I just had to be more patient?!?!?
Thanks anyway Dave.
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