If you are prestaging the computer account for later installation via RIS, mark the This Is a Managed Computer check box and type in the computer's unique ID (GUID/UUID), referred to as its globally unique identifier or its universally unique identifier. This extra security measure prevents unauthorized RIS client installations because only computers with matching GUIDs are allowed to be installed via RIS when you follow this procedure. You can find the GUID or UUID in the computer's BIOS or by using a third-party software utility
Tontonsam wrote: I try again but it doesn't work. Both firewall are off. The DNS is good cause i can ping the remote computer by its hostname. and the RPC service is started on both PC and server. Some computers give error message "Network path not found", some others give the network is unreachable, do you want to connect. You connect but cannot access to disk managment, device manager or other settings....