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Port 2660 (gcmonitor)

IANA assigns port 2660 to gcmonitor: GC Monitor.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
gcmonitor TCP GC Monitor Gustavo Rodriguez Ri -
gcmonitor UDP GC Monitor Gustavo Rodriguez Ri -

Check what is listening on port 2660

Linux: is anything listening on TCP 2660?
sudo ss -tlnp 'sport = :2660'
Linux: UDP 2660
sudo ss -ulnp 'sport = :2660'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2660
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2660 '
Windows (Command Prompt)
netstat -ano | findstr :2660
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2660 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2660
From Windows
Test-NetConnection HOST -Port 2660
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2660

Block port 2660 in the firewall

ufw
sudo ufw deny 2660/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2660 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2660 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2660' -Direction Inbound -Protocol TCP -LocalPort 2660 -Action Block
ufw
sudo ufw deny 2660/udp
iptables
sudo iptables -A INPUT -p udp --dport 2660 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2660 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2660' -Direction Inbound -Protocol UDP -LocalPort 2660 -Action Block

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