Yesterday, Martin Vogel from sirius-net GmbH sent me an email and asked for help with HCL Domino DirSync. He had an issue with the filter syntax and also encountered some strange error messages when trying to sync from an Active Directory to Domino Directory. Let’s first see, what the problem with the filter is. By default, DirSync syncs all person and group objects under the given SearchBase. If you only want to get a subset of the possible results, you can use a filter in the DirSync Configuration document. Here is the filter. (&(objectClass=person)(memberOf=CN=DistributionGroup,CN=Services & Accounts,CN=Sync,DC=ad,DC=fritz,DC=box))