CyberHunter
Local dataset, no network
// Other services

Port 3961: ProAxess Server

Port 3961 is assigned by IANA to proaxess (ProAxess Server).

3961

How proaxess works

Other services
client:3961proaxessresponse client:3961proaxessresponse

The client sends a request to port 3961 and the proaxess service answers.

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
Other services
01 Security

Is port 3961 dangerous?

We have no specific security note for port 3961. 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 3961

ServicePortTransportDescriptionReferenceUpdated
proaxess 3961 TCP, UDP ProAxess Server - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 3961, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3961'      # process listening on 3961
sudo lsof -nP -i :3961

macOS

sudo lsof -nP -i :3961

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3961 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3961
netstat -ano | findstr :3961

From another machine

nmap -p 3961 -sV <host>
sudo nmap -sU -p 3961 <host>
nc -zv <host> 3961

Block it in the firewall

sudo ufw deny 3961/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3961" -Direction Inbound -LocalPort 3961 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3961 used for?

Port 3961 is assigned by IANA to proaxess (ProAxess Server).

Is port 3961 TCP or UDP?

Port 3961 is registered for TCP and UDP.

Is it safe to open port 3961?

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 3961 is open?

On Linux run "ss -ltnup 'sport = :3961'", on macOS "lsof -nP -i :3961", and on Windows "netstat -ano | findstr :3961" to see the local process. From another machine, "nmap -p 3961 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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