When assigning ports to RPC applications that must listen on a TCP endpoint, RPC by default utilizes the ephemeral port range (1024-5000).
This behavior can make it difficult for network administrators to limit access to these ports. Use the Windows Defender Firewall with Advanced Security node in the Group Policy Management interface to create two firewall rules to permit inbound remote procedure call (RPC) network traffic. The first rule permits inbound network packets to the RPC Endpoint Mapper service on TCP port 135. One of the two primary methods of data transmission in a TCP/IP network is TCP. The other one is UDP, a best-effort connectionless protocol. TCP ports are used by devices to communicate through TCP.
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