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Port 3644 (ssowatch)

IANA assigns port 3644 to ssowatch.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ssowatch TCP ssowatch Marie France Dubreui -
ssowatch UDP ssowatch Marie France Dubreui -

Registry dates for this port: registered 2002-11.

Check what is listening on port 3644

Linux: is anything listening on TCP 3644?
sudo ss -tlnp 'sport = :3644'
Linux: UDP 3644
sudo ss -ulnp 'sport = :3644'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3644
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3644 '
Windows (Command Prompt)
netstat -ano | findstr :3644
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3644 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3644
From Windows
Test-NetConnection HOST -Port 3644
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3644

Block port 3644 in the firewall

ufw
sudo ufw deny 3644/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3644 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3644 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3644' -Direction Inbound -Protocol TCP -LocalPort 3644 -Action Block
ufw
sudo ufw deny 3644/udp
iptables
sudo iptables -A INPUT -p udp --dport 3644 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3644 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3644' -Direction Inbound -Protocol UDP -LocalPort 3644 -Action Block

Related ports

3642juxml-port3643audiojuggler3645cyc3646xss-srv-port

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.