Hi all, I have tried running my client and server (on separate pcs) on the same network, no domain without any problems. But when I place my client(same pc) on a different network, trying to DAdvise (method shown below), I get an error message stating that RPC Server is unavailable. Result = PIDataObject->DAdvise(&formatetc, 0, pSink, &dwUpdateConnection); if(FAILED(Result)) throw "Failed to perform PIDataObject->DAdvise"; Is different configuration needed for client and server on different networks? I have am using same user accounts and have given access and launch permissions locally and remotely to Administrators, the chosen user and System. I also give access permission to Anonymous Logon because the client will complain that no permission is given to Anonymous logon. TIA for any help given. Atiz
I have realised that it is the firewall that is causing the problem. DCOM can work through different networks without any problems. Even though the firewall allows all to pass through, you have to take note of firewalls which do address translation because DCOM cannot work if the firewall does that. Quote: " the client must be able to reach the server by its actual IP address. You cannot use DCOM through firewalls that do address translation (i.e. where a client connects to virtual address 198.252.145.1 that the firewall maps transparently to the server's actual address of, say, 192.100.81.101). This is because DCOM stores raw IP addresses in the interface marshaling packets and if the client cannot connect to the address specified in the packet, it won't work." You can find out more from http://msdn2.microsoft.com/en-us/library/ms809327.aspx Atiz
