Rich, so you're saying: DECnet IV works after a fresh install of VSI VMS V8.4-2L1, but doesn't after an upgrade from HP VMS V8.4 ? Any DECnet OPCOM messages ? $ MC NCP SHOW KNO LINE COUNT $ MC NCP SHOW KNO CIRC COUNT DECnet license active ? TCPIP started AFTER DECnet ? Volker.