Port 135 · MS-RPC Endpoint Mapper

Port 135 is MS-RPC Endpoint Mapper, TCP.

Microsoft RPC endpoint mapper — clients query this port to find which dynamic high port a service is using. Required for WMI, DCOM, and AD replication.

Palo Alto

Create the service object for this port, then allow the App-ID on it. Restricting the rule to the port's service object keeps the rule working on a non-default port and stops the App-ID matching on other ports. Replace the placeholders with your own rule name and zones.

set service tcp-135 protocol tcp port 135

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application msrpc service tcp-135 action allow

Risk and exposure

Rated medium risk. Restrict this port to the sources that need it and keep the service patched; avoid exposing it to the whole internet unless the service is meant to be public.

Check it

• Linux ss -tlnp | grep :135
• PowerShell Test-NetConnection <host> -Port 135
• nmap nmap -p 135 <host>

Related ports

• 2380 etcd Peer
• 111 RPC Portmapper
• 593 MS-RPC over HTTP
• 88 Kerberos
• 389 LDAP
• 445 SMB

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