Using "Require group" in mod_dav_svn and Active Directory?

Hi!

Im trying to set up a repository using Apache,
mod_dav_svn and authentication against Active
Directory via LDAP.

Per-user authentication using the "Require valid user"
directive works well, but I'm not able to use the
"Require group" directive, the svn-client says:

  svn: Commit failed (details follow):
  svn: MKACTIVITY of /projects/svntest/!svn/act/77248e0e-0103-0410-8b28-e97d89f45485: 500 Internal Server Error (http://frqwol31ux:90)

and in apache2/error.log there is

  [Thu Oct 13 13:29:44 2005] [crit] [client 172.17.2.1] configuration error: couldn't check access. No groups file?: /projects/svntest/!svn/act/77248e0e-0103-0410-8b28-e97d89f45485

This is my dav_svn.conf:

<Location /projects/svntest>
  DAV svn
  SVNPath /usr/local/svn/svntest
  AuthType Basic
  AuthName "Subversion Repository"
  AuthLDAPEnabled on
  AuthLDAPAuthoritative off
  AuthLDAPURL "removed"
  AuthLDAPBindDN "removed"
  AuthLDAPBindPassword XXXXXX
  AuthLDAPGroupAttribute member
  AuthLDAPGroupAttributeIsDN on
  #AuthzSVNAccessFile /etc/apache2/dav_svn.authz
  <LimitExcept GET PROPFIND OPTIONS REPORT>
     Require group CN=ITM,OU=Groups,OU=ORG,DC=frequentis,DC=frq
     #Require valid-user
   </LimitExcept>
</Location>

Any suggestions anyone?
Thanks in advance
Helmut

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