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Port 2609 (system-monitor)

IANA assigns port 2609 to system-monitor: System Monitor.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
system-monitor TCP System Monitor Greg Robson Garth -
system-monitor UDP System Monitor Greg Robson Garth -

Check what is listening on port 2609

Linux: is anything listening on TCP 2609?
sudo ss -tlnp 'sport = :2609'
Linux: UDP 2609
sudo ss -ulnp 'sport = :2609'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2609
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2609 '
Windows (Command Prompt)
netstat -ano | findstr :2609
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2609 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2609
From Windows
Test-NetConnection HOST -Port 2609
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2609

Block port 2609 in the firewall

ufw
sudo ufw deny 2609/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2609 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2609 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2609' -Direction Inbound -Protocol TCP -LocalPort 2609 -Action Block
ufw
sudo ufw deny 2609/udp
iptables
sudo iptables -A INPUT -p udp --dport 2609 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2609 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2609' -Direction Inbound -Protocol UDP -LocalPort 2609 -Action Block

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