Hello All, when i try to add a new member to local group using: net rpc group addmem Hauptbenutzer "DOM\lokale-Hauptbenutzer" -UPCNAME\administrator%password -S PCNAME i get: Could not add DOM\lokale-Hauptbenutzer to Hauptbenutzer: NT_STATUS_MEMBER_IN_ALIAS what does that mean? Any hints? Regards, Mario Wolff PS: tryed to use the SID of "DOM\lokale-Hauptbenutzer", same result! SID is S-1-5-21-xxxxxxxx-xxxxxxxx-1041, no known ALIAS-SID!