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// Other services

Port 6901: Novell Jetstream messaging protocol

Port 6901 is assigned by IANA to jetstream (Novell Jetstream messaging protocol).

6901

How jetstream works

Other services
client:6901jetstreamresponse client:6901jetstreamresponse

The client sends a request to port 6901 and the jetstream service answers.

Transport
TCP
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
Other services
01 Security

Is port 6901 dangerous?

We have no specific security note for port 6901. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 6901

ServicePortTransportDescriptionReferenceUpdated
jetstream 6901 TCP Novell Jetstream messaging protocol - 2010-06-11
-6901-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 6901, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6901'      # process listening on 6901
sudo lsof -nP -i :6901

macOS

sudo lsof -nP -i :6901

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6901 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6901
netstat -ano | findstr :6901

From another machine

nmap -p 6901 -sV <host>
nc -zv <host> 6901

Block it in the firewall

sudo ufw deny 6901/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6901" -Direction Inbound -LocalPort 6901 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6901 used for?

Port 6901 is assigned by IANA to jetstream (Novell Jetstream messaging protocol).

Is port 6901 TCP or UDP?

Port 6901 is registered for TCP.

Is it safe to open port 6901?

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. Close the port if nothing on the host needs it.

How do I check if port 6901 is open?

On Linux run "ss -ltnup 'sport = :6901'", on macOS "lsof -nP -i :6901", and on Windows "netstat -ano | findstr :6901" to see the local process. From another machine, "nmap -p 6901 <host>" shows whether it is reachable.

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