Do RPC calls use TCP ports ?

In a Microsoft distributed component environment (ActiveX/DCOM), DCE/RPC is used to call methods on remote objects (Active X components).
Do Rpc's use TCP/UDP ports ? Which one ?
Using the Internet, will firewalls stop these rpc calls ?
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ahoffmannConnect With a Mentor Commented:
RPC port is 530 tcp/udp.
Don't know if M$ uses this standard, most NT descriptions say they do.

Yes firewalls may/should/must restrict this port.
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