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Port 3222 (glbp)

IANA assigns port 3222 to glbp: Gateway Load Balancing Pr.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
glbp TCP Gateway Load Balancing Pr Douglas McLaggan -
glbp UDP Gateway Load Balancing Pr Douglas McLaggan -

Check what is listening on port 3222

Linux: is anything listening on TCP 3222?
sudo ss -tlnp 'sport = :3222'
Linux: UDP 3222
sudo ss -ulnp 'sport = :3222'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3222
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3222 '
Windows (Command Prompt)
netstat -ano | findstr :3222
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3222 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3222
From Windows
Test-NetConnection HOST -Port 3222
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3222

Block port 3222 in the firewall

ufw
sudo ufw deny 3222/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3222 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3222 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3222' -Direction Inbound -Protocol TCP -LocalPort 3222 -Action Block
ufw
sudo ufw deny 3222/udp
iptables
sudo iptables -A INPUT -p udp --dport 3222 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3222 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3222' -Direction Inbound -Protocol UDP -LocalPort 3222 -Action Block

Related ports

3220xnm-ssl3221xnm-clear-text3223digivote3224aes-discovery

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