7.405 user portal login for AD group member fails

Hi,

I followed the steps in http://portal.knowledgebase.net/display/2n/kb/article.asp?aid=302244

I want to enable the members of one AD group to log into user portal
and then use remote access via SSL.

I have a working connection to AD, test authentication on Active Directory
Configuration page works, two configured backend group memberships
are shown properly. (astaro has joined the domain)
(the members of one group shall be able to use the user portal, the other
group I created only to verify that the membership is detected correctly)

First error is in the log when I prefetch one goup:

2009:09:23-22:08:13 mail user_prefetch[30693]: ------------------------------------------------------------
2009:09:23-22:08:13 mail user_prefetch[30693]: Adding/updating users
2009:09:23-22:08:13 mail user_prefetch[30693]: ------------------------------------------------------------
2009:09:23-22:08:13 mail user_prefetch[30693]: # 1 Creating user testuser
2009:09:23-22:08:13 mail user_prefetch[30693]: Failed to set object
2009:09:23-22:08:13 mail user_prefetch[30693]: >=========================================================================
2009:09:23-22:08:13 mail user_prefetch[30693]: $VAR1 = [
2009:09:23-22:08:13 mail user_prefetch[30693]: 'OBJECT_NAMESPACE',
2009:09:23-22:08:13 mail user_prefetch[30693]: ''
2009:09:23-22:08:13 mail user_prefetch[30693]: ];
2009:09:23-22:08:13 mail user_prefetch[30693]: 

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