Port 135 — MS RPC / EPMAP
Quick reference for TCP/UDP port 135, used by MS RPC / EPMAP. Includes what the service does, security guidance and related ports.
What is port 135?
Microsoft DCOM / RPC endpoint mapper. Block at the firewall.
What port does MS RPC / EPMAP use?
MS RPC / EPMAP listens on port 135 by default.
Security guidance
High risk — do not expose to the internet
Port 135 (MS RPC / EPMAP) is high-risk because the service it carries is a frequent target for credential attacks, brute force or unpatched-vulnerability scanning. Keep it bound to localhost or your VPN, never forward it directly on a router, and require strong authentication.
Related ports
Frequently asked
What is port 135 used for?+
Port 135 is the standard TCP/UDP port for MS RPC / EPMAP. Microsoft DCOM / RPC endpoint mapper. Block at the firewall.
What port does MS RPC / EPMAP use?+
MS RPC / EPMAP listens on port 135 by default.
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