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Port 3361 (kv-agent)

IANA assigns port 3361 to kv-agent: KV Agent.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
kv-agent TCP KV Agent Thomas Soranno -
kv-agent UDP KV Agent Thomas Soranno -

Check what is listening on port 3361

Linux: is anything listening on TCP 3361?
sudo ss -tlnp 'sport = :3361'
Linux: UDP 3361
sudo ss -ulnp 'sport = :3361'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3361
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3361 '
Windows (Command Prompt)
netstat -ano | findstr :3361
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3361 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3361
From Windows
Test-NetConnection HOST -Port 3361
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3361

Block port 3361 in the firewall

ufw
sudo ufw deny 3361/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3361 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3361 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3361' -Direction Inbound -Protocol TCP -LocalPort 3361 -Action Block
ufw
sudo ufw deny 3361/udp
iptables
sudo iptables -A INPUT -p udp --dport 3361 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3361 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3361' -Direction Inbound -Protocol UDP -LocalPort 3361 -Action Block

Related ports

3359wg-netforce3360kv-server3362dj-ilm3363nati-vi-server

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