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Port 3600 (trap-daemon)

IANA assigns port 3600 to trap-daemon: text relay-answer.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
trap-daemon TCP text relay-answer John Willis -
trap-daemon UDP text relay-answer John Willis -

Registry dates for this port: registered 2002-09, last modified 2017-07-26.

Check what is listening on port 3600

Linux: is anything listening on TCP 3600?
sudo ss -tlnp 'sport = :3600'
Linux: UDP 3600
sudo ss -ulnp 'sport = :3600'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3600
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3600 '
Windows (Command Prompt)
netstat -ano | findstr :3600
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3600 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3600
From Windows
Test-NetConnection HOST -Port 3600
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3600

Block port 3600 in the firewall

ufw
sudo ufw deny 3600/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3600 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3600 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3600' -Direction Inbound -Protocol TCP -LocalPort 3600 -Action Block
ufw
sudo ufw deny 3600/udp
iptables
sudo iptables -A INPUT -p udp --dport 3600 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3600 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3600' -Direction Inbound -Protocol UDP -LocalPort 3600 -Action Block

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