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// Directory & authentication

Port 9002: DynamID authentication

Port 9002 is assigned by IANA to dynamid (DynamID authentication).

9002

How dynamid works

Directory & authentication
userdirectorydynamidresponse userdirectorydynamidresponse

The client proves who it is on port 9002 and gets an answer (or a ticket) it can use with other services.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Directory & authentication
01 Security

Is port 9002 dangerous?

We have no specific security note for port 9002. Its risk depends on the program actually listening on it. General advice for directory & authentication services:

  • Keep directory and authentication services on internal networks.
  • Require signing or TLS and disable anonymous queries.
  • Monitor authentication failures for spraying and brute force.
02 Registry

IANA registry entries for port 9002

ServicePortTransportDescriptionReferenceUpdated
dynamid 9002 TCP, UDP DynamID authentication - 2002-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 9002, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9002'      # process listening on 9002
sudo lsof -nP -i :9002

macOS

sudo lsof -nP -i :9002

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9002 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9002
netstat -ano | findstr :9002

From another machine

nmap -p 9002 -sV <host>
sudo nmap -sU -p 9002 <host>
nc -zv <host> 9002

Block it in the firewall

sudo ufw deny 9002/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9002" -Direction Inbound -LocalPort 9002 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9002 used for?

Port 9002 is assigned by IANA to dynamid (DynamID authentication).

Is port 9002 TCP or UDP?

Port 9002 is registered for TCP and UDP.

Is it safe to open port 9002?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Keep directory and authentication services on internal networks.

How do I check if port 9002 is open?

On Linux run "ss -ltnup 'sport = :9002'", on macOS "lsof -nP -i :9002", and on Windows "netstat -ano | findstr :9002" to see the local process. From another machine, "nmap -p 9002 <host>" shows whether it is reachable.

05 Related
:389 LDAP tcp · udp · high risk :636 LDAPS tcp · udp · moderate risk :88 Kerberos tcp · udp · high risk :3268 Global Catalog (LDAP) tcp · udp · high risk :1812 RADIUS udp · tcp · moderate risk :31 MSG Authentication tcp · udp :49 Login Host Protocol (TACACS) tcp · udp :56 XNS Authentication tcp · udp

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