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// Directory & authentication

Port 9612: StreamComm User Directory

Port 9612 is assigned by IANA to streamcomm-ds (StreamComm User Directory).

9612

How streamcomm-ds works

Directory & authentication
userdirectorystreamcomm-dsresponse userdirectorystreamcomm-dsresponse

The client proves who it is on port 9612 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 9612 dangerous?

We have no specific security note for port 9612. 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 9612

ServicePortTransportDescriptionReferenceUpdated
streamcomm-ds 9612 TCP, UDP StreamComm User Directory - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 9612, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9612'      # process listening on 9612
sudo lsof -nP -i :9612

macOS

sudo lsof -nP -i :9612

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9612 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9612
netstat -ano | findstr :9612

From another machine

nmap -p 9612 -sV <host>
sudo nmap -sU -p 9612 <host>
nc -zv <host> 9612

Block it in the firewall

sudo ufw deny 9612/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9612" -Direction Inbound -LocalPort 9612 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9612 used for?

Port 9612 is assigned by IANA to streamcomm-ds (StreamComm User Directory).

Is port 9612 TCP or UDP?

Port 9612 is registered for TCP and UDP.

Is it safe to open port 9612?

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 9612 is open?

On Linux run "ss -ltnup 'sport = :9612'", on macOS "lsof -nP -i :9612", and on Windows "netstat -ano | findstr :9612" to see the local process. From another machine, "nmap -p 9612 <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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