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Port 4969 (ccss-qmm)

IANA assigns port 4969 to ccss-qmm: CCSS QMessageMonitor.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ccss-qmm TCP CCSS QMessageMonitor - -
ccss-qmm UDP CCSS QMessageMonitor - -

Check what is listening on port 4969

Linux: is anything listening on TCP 4969?
sudo ss -tlnp 'sport = :4969'
Linux: UDP 4969
sudo ss -ulnp 'sport = :4969'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4969
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4969 '
Windows (Command Prompt)
netstat -ano | findstr :4969
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4969 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4969
From Windows
Test-NetConnection HOST -Port 4969
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4969

Block port 4969 in the firewall

ufw
sudo ufw deny 4969/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4969 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4969 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4969' -Direction Inbound -Protocol TCP -LocalPort 4969 -Action Block
ufw
sudo ufw deny 4969/udp
iptables
sudo iptables -A INPUT -p udp --dport 4969 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4969 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4969' -Direction Inbound -Protocol UDP -LocalPort 4969 -Action Block

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