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// Other services

Port 3644: ssowatch

Port 3644 is assigned by IANA to ssowatch (ssowatch).

3644

How ssowatch works

Other services
client:3644ssowatchresponse client:3644ssowatchresponse

The client sends a request to port 3644 and the ssowatch 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 3644 dangerous?

We have no specific security note for port 3644. 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 3644

ServicePortTransportDescriptionReferenceUpdated
ssowatch 3644 TCP, UDP ssowatch - 2002-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 3644, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3644'      # process listening on 3644
sudo lsof -nP -i :3644

macOS

sudo lsof -nP -i :3644

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3644 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3644
netstat -ano | findstr :3644

From another machine

nmap -p 3644 -sV <host>
sudo nmap -sU -p 3644 <host>
nc -zv <host> 3644

Block it in the firewall

sudo ufw deny 3644/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3644" -Direction Inbound -LocalPort 3644 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3644 used for?

Port 3644 is assigned by IANA to ssowatch (ssowatch).

Is port 3644 TCP or UDP?

Port 3644 is registered for TCP and UDP.

Is it safe to open port 3644?

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 3644 is open?

On Linux run "ss -ltnup 'sport = :3644'", on macOS "lsof -nP -i :3644", and on Windows "netstat -ano | findstr :3644" to see the local process. From another machine, "nmap -p 3644 <host>" shows whether it is reachable.

05 Related
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