Port 464 · Kerberos kpasswd

Port 464 is Kerberos kpasswd, TCP and UDP.

Kerberos password change service — used when resetting or changing Active Directory passwords.

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-464 protocol tcp port 464
set service udp-464 protocol udp port 464

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application kerberos service [ tcp-464 udp-464 ] 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 :464
• Linux ss -ulnp | grep :464
• PowerShell Test-NetConnection <host> -Port 464
• nmap nmap -p 464 <host>
• nmap nmap -sU -p 464 <host>

Related ports

• 88 Kerberos
• 123 NTP
• 389 LDAP
• 636 LDAPS
• 3268 AD Global Catalog
• 3269 AD Global Catalog SSL

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