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Port 135

MS-RPC

Microsoft RPC endpoint mapper — core Windows service

Port
135
Protocol
TCP
Service
MS-RPC
Security
Dangerous
Full name: Microsoft RPC Endpoint Mapper

What is port 135?

Port 135 is used by Windows for the Microsoft RPC Endpoint Mapper, which directs clients to the correct dynamic port for DCOM, WMI, Exchange, and Active Directory replication services. Historically it has been the entry point for serious worms such as Blaster and Sasser. It must be blocked at the internet perimeter and permitted only within trusted internal networks.

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