I set the IP address on the 6400 and save it as perscribed. Printer has ethernet card in it. When I attache the network cable (cat5) to the printer the IP address changes. When I go to change the IP address the message " dynamically set, param read only" appeares momentarally, then goes away. If I unplug the cable, turn the printer off, and back on, the IP address I set originally is back. When I plug the cable back in the IP address changes. Have DHCP disabled. Your help would be greatly appreciated.