Port 593 · MS-RPC over HTTP

Port 593 is MS-RPC over HTTP, TCP.

Microsoft RPC over HTTP — allows RPC calls to traverse HTTP proxies and firewalls. Used by Exchange Outlook Anywhere and some AD services.

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-593 protocol tcp port 593

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application msrpc service tcp-593 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 :593
• PowerShell Test-NetConnection <host> -Port 593
• nmap nmap -p 593 <host>

Related ports

• 80 HTTP
• 3128 HTTP Proxy
• 8080 HTTP Alternate
• 111 RPC Portmapper
• 135 MS-RPC Endpoint Mapper
• 1080 SOCKS Proxy

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