Some users can log on, and other cannot

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From: Rod (rodf_at_newsgroups.nospam)
Date: 09/29/04 

Date: Wed, 29 Sep 2004 14:34:58 -0600

We are implementing an ASP.NET application which uses forms authentication
but authenticates using Active Directory in a Windows 2000 domain. (I used
MSDN article 326340 to help me set all of this up.)

I have found that some of my users can log into the new ASP.NET application
just fine, but others cannot. For example, one of my users is Bill and
another is Paul. Bill can log in just fine, but Paul cannot. I went into
Active Directory Users and Computers and took a look at both of them, and I
found that Bill is a member of "Domain Users" and "Providers" (an OU we
have), whereas Paul is a member of "Domain Users", "Providers" and another
OU called "ProvidersMailList". So, even though Paul is a member of more
groups, including all those that Bill is a member of, Paul cannot log in but
Bill can. When Paul tries to log in he gets an error that says:

"Error obtaining group names. Object reference not set to an instance of an
object."

(The error is coming from the LdapAuthentication.vb class, I am sure.)

What could be causing these problems?

Rod

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