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Port 3220 (xnm-ssl)

IANA assigns port 3220 to xnm-ssl: XML NM over SSL.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
xnm-ssl TCP XML NM over SSL - -
xnm-ssl UDP XML NM over SSL - -

Check what is listening on port 3220

Linux: is anything listening on TCP 3220?
sudo ss -tlnp 'sport = :3220'
Linux: UDP 3220
sudo ss -ulnp 'sport = :3220'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3220
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3220 '
Windows (Command Prompt)
netstat -ano | findstr :3220
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3220 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3220
From Windows
Test-NetConnection HOST -Port 3220
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3220

Block port 3220 in the firewall

ufw
sudo ufw deny 3220/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3220 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3220 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3220' -Direction Inbound -Protocol TCP -LocalPort 3220 -Action Block
ufw
sudo ufw deny 3220/udp
iptables
sudo iptables -A INPUT -p udp --dport 3220 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3220 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3220' -Direction Inbound -Protocol UDP -LocalPort 3220 -Action Block

Related ports

3218smartpackets3219wms-messenger3221xnm-clear-text3222glbp

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