I need to create an application syncing 2 Active Directories: For each User in Actice Directory A, a Contact-Document should be created in Active Directory B. .net Framework already provides System.DirectoryServices for this purpose. Doing some tests I got the following System.DirectoryServices.DirectoryServicesCOMException: “The server is unwilling to process the request.” OK, maybe I should wait some minutes until the server is willing to process my request? Or maybe after weekend? That was not an option Searching around I found several solutions, e.g. properties were not written case-sensitive or typing errors.