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// Directory & authentication

Port 2392: Tactical Auth

Port 2392 is assigned by IANA to tacticalauth (Tactical Auth).

2392

How tacticalauth works

Directory & authentication
userdirectorytacticalauthresponse userdirectorytacticalauthresponse

The client proves who it is on port 2392 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 2392 dangerous?

We have no specific security note for port 2392. 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 2392

ServicePortTransportDescriptionReferenceUpdated
tacticalauth 2392 TCP, UDP Tactical Auth - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2392, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2392'      # process listening on 2392
sudo lsof -nP -i :2392

macOS

sudo lsof -nP -i :2392

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2392 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2392
netstat -ano | findstr :2392

From another machine

nmap -p 2392 -sV <host>
sudo nmap -sU -p 2392 <host>
nc -zv <host> 2392

Block it in the firewall

sudo ufw deny 2392/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2392" -Direction Inbound -LocalPort 2392 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2392 used for?

Port 2392 is assigned by IANA to tacticalauth (Tactical Auth).

Is port 2392 TCP or UDP?

Port 2392 is registered for TCP and UDP.

Is it safe to open port 2392?

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 2392 is open?

On Linux run "ss -ltnup 'sport = :2392'", on macOS "lsof -nP -i :2392", and on Windows "netstat -ano | findstr :2392" to see the local process. From another machine, "nmap -p 2392 <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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