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// Directory & authentication

Port 3024: NDS_SSO

Port 3024 is assigned by IANA to nds_sso (NDS_SSO), nds-sso (NDS_SSO IANA assigned this well-formed service name as a replacement for "nds_sso".).

3024

How nds_sso works

Directory & authentication
userdirectorynds_ssoresponse userdirectorynds_ssoresponse

The client proves who it is on port 3024 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
Assigned2 registered services
Range
Registered (1024-49151)
Category
Directory & authentication
01 Security

Is port 3024 dangerous?

We have no specific security note for port 3024. 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 3024

ServicePortTransportDescriptionReferenceUpdated
nds_sso 3024 TCP, UDP NDS_SSO - -
nds-sso 3024 TCP, UDP NDS_SSO IANA assigned this well-formed service name as a replacement for "nds_sso". - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3024, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3024'      # process listening on 3024
sudo lsof -nP -i :3024

macOS

sudo lsof -nP -i :3024

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3024 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3024
netstat -ano | findstr :3024

From another machine

nmap -p 3024 -sV <host>
sudo nmap -sU -p 3024 <host>
nc -zv <host> 3024

Block it in the firewall

sudo ufw deny 3024/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3024" -Direction Inbound -LocalPort 3024 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3024 used for?

Port 3024 is assigned by IANA to nds_sso (NDS_SSO), nds-sso (NDS_SSO IANA assigned this well-formed service name as a replacement for "nds_sso".).

Is port 3024 TCP or UDP?

Port 3024 is registered for TCP and UDP.

Is it safe to open port 3024?

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 3024 is open?

On Linux run "ss -ltnup 'sport = :3024'", on macOS "lsof -nP -i :3024", and on Windows "netstat -ano | findstr :3024" to see the local process. From another machine, "nmap -p 3024 <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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