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// Other services

Port 17222: Control Plane Synchronization Protocol (SPSP)

Port 17222 is assigned by IANA to cpsp (Control Plane Synchronization Protocol (SPSP)).

17222

How cpsp works

Other services
client:17222cpspresponse client:17222cpspresponse

The client sends a request to port 17222 and the cpsp service answers.

Transport
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 17222 dangerous?

We have no specific security note for port 17222. 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 17222

ServicePortTransportDescriptionReferenceUpdated
cpsp 17222 UDP Control Plane Synchronization Protocol (SPSP) - 2011-11-10
-17222-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 17222, and is it reachable?

Linux

sudo ss -ltnup 'sport = :17222'      # process listening on 17222
sudo lsof -nP -i :17222

macOS

sudo lsof -nP -i :17222

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 17222 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 17222
netstat -ano | findstr :17222

From another machine

nmap -p 17222 -sV <host>
sudo nmap -sU -p 17222 <host>
nc -zv <host> 17222

Block it in the firewall

sudo ufw deny 17222/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 17222" -Direction Inbound -LocalPort 17222 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 17222 used for?

Port 17222 is assigned by IANA to cpsp (Control Plane Synchronization Protocol (SPSP)).

Is port 17222 TCP or UDP?

Port 17222 is registered for UDP.

Is it safe to open port 17222?

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 17222 is open?

On Linux run "ss -ltnup 'sport = :17222'", on macOS "lsof -nP -i :17222", and on Windows "netstat -ano | findstr :17222" to see the local process. From another machine, "nmap -p 17222 <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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