Port 9389 · AD Web Services

Port 9389 is AD Web Services, TCP.

Active Directory Web Services — used by the PowerShell Active Directory module (Get-ADUser, etc.) and ADAC.

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-9389 protocol tcp port 9389

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application msrpc-base service tcp-9389 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 :9389
• PowerShell Test-NetConnection <host> -Port 9389
• nmap nmap -p 9389 <host>

Related ports

• 5985 WinRM HTTP
• 5986 WinRM HTTPS
• 88 Kerberos
• 135 MS-RPC Endpoint Mapper
• 389 LDAP
• 445 SMB

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