Port 111 · RPC Portmapper

Port 111 is RPC Portmapper, TCP and UDP.

ONC RPC portmapper (rpcbind) — maps RPC program numbers to port numbers. Required for NFS. A known target for enumeration.

Palo Alto

Create the service objects 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-111 protocol tcp port 111
set service udp-111 protocol udp port 111

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application sunrpc service [ tcp-111 udp-111 ] 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 :111
• Linux ss -ulnp | grep :111
• PowerShell Test-NetConnection <host> -Port 111
• nmap nmap -p 111 <host>
• nmap nmap -sU -p 111 <host>

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• 10000 Webmin

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