Port 6060 (x11)

IANA assigns port 6060 to x11: X Window System.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

x11 TCP X Window System (range 6000-6063) Stephen Gildea -

x11 UDP X Window System (range 6000-6063) Stephen Gildea -

Linux: is anything listening on TCP 6060?

sudo ss -tlnp 'sport = :6060'

Linux: UDP 6060

sudo ss -ulnp 'sport = :6060'

Linux / macOS: which process owns the port

sudo lsof -nP -i :6060

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':6060 '

Windows (Command Prompt)

netstat -ano | findstr :6060

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6060 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 6060

From Windows

Test-NetConnection HOST -Port 6060

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 6060

ufw

sudo ufw deny 6060/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 6060 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 6060 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 6060' -Direction Inbound -Protocol TCP -LocalPort 6060 -Action Block

ufw

sudo ufw deny 6060/udp

iptables

sudo iptables -A INPUT -p udp --dport 6060 -j DROP

nftables

sudo nft add rule inet filter input udp dport 6060 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 6060' -Direction Inbound -Protocol UDP -LocalPort 6060 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.