HTTPfy

Port 2409 (sns-protocol)

IANA assigns port 2409 to sns-protocol: SNS Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sns-protocol TCP SNS Protocol Amir Blich -
sns-protocol UDP SNS Protocol Amir Blich -

Check what is listening on port 2409

Linux: is anything listening on TCP 2409?
sudo ss -tlnp 'sport = :2409'
Linux: UDP 2409
sudo ss -ulnp 'sport = :2409'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2409
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2409 '
Windows (Command Prompt)
netstat -ano | findstr :2409
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2409 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2409
From Windows
Test-NetConnection HOST -Port 2409
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2409

Block port 2409 in the firewall

ufw
sudo ufw deny 2409/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2409 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2409 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2409' -Direction Inbound -Protocol TCP -LocalPort 2409 -Action Block
ufw
sudo ufw deny 2409/udp
iptables
sudo iptables -A INPUT -p udp --dport 2409 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2409 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2409' -Direction Inbound -Protocol UDP -LocalPort 2409 -Action Block

Related ports

2407orion2408railgun-webaccl2410vrts-registry2411netwave-ap-mgmt

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