CyberHunter
Local dataset, no network
// Other services

Port 2955: CSNOTIFY

Port 2955 is assigned by IANA to csnotify (CSNOTIFY).

2955

How csnotify works

Other services
client:2955csnotifyresponse client:2955csnotifyresponse

The client sends a request to port 2955 and the csnotify 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 2955 dangerous?

We have no specific security note for port 2955. 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 2955

ServicePortTransportDescriptionReferenceUpdated
csnotify 2955 TCP, UDP CSNOTIFY - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2955, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2955'      # process listening on 2955
sudo lsof -nP -i :2955

macOS

sudo lsof -nP -i :2955

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2955 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2955
netstat -ano | findstr :2955

From another machine

nmap -p 2955 -sV <host>
sudo nmap -sU -p 2955 <host>
nc -zv <host> 2955

Block it in the firewall

sudo ufw deny 2955/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2955" -Direction Inbound -LocalPort 2955 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2955 used for?

Port 2955 is assigned by IANA to csnotify (CSNOTIFY).

Is port 2955 TCP or UDP?

Port 2955 is registered for TCP and UDP.

Is it safe to open port 2955?

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 2955 is open?

On Linux run "ss -ltnup 'sport = :2955'", on macOS "lsof -nP -i :2955", and on Windows "netstat -ano | findstr :2955" to see the local process. From another machine, "nmap -p 2955 <host>" shows whether it is reachable.

05 Related
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