Answer / nadeem

The port 135 must be open to accept the incoming remote
connection to the Service Control Manager (SCM), which
provides RPC-based services for DCOM.
So the purpose of Port 135 is to allow to client to locate
a DCOM service.

Answer / Pankaj Dhaka

For Distributed Component Object Model (DCOM) to work across a network, several ports need to be open. Port 135 (RPC over TCP/IP endpoint mapper) is one of them and plays a crucial role in mapping RPC calls to specific endpoints and providing dynamic port assignments for other RPC communication. Other essential ports include the DCOM dynamic port range (49000-50000).n

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