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Port 2419 (attachmate-s2s)

IANA assigns port 2419 to attachmate-s2s: Attachmate S2S.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
attachmate-s2s TCP Attachmate S2S Chris Rominski -
attachmate-s2s UDP Attachmate S2S Chris Rominski -

Check what is listening on port 2419

Linux: is anything listening on TCP 2419?
sudo ss -tlnp 'sport = :2419'
Linux: UDP 2419
sudo ss -ulnp 'sport = :2419'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2419
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2419 '
Windows (Command Prompt)
netstat -ano | findstr :2419
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2419 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2419
From Windows
Test-NetConnection HOST -Port 2419
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2419

Block port 2419 in the firewall

ufw
sudo ufw deny 2419/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2419 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2419 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2419' -Direction Inbound -Protocol TCP -LocalPort 2419 -Action Block
ufw
sudo ufw deny 2419/udp
iptables
sudo iptables -A INPUT -p udp --dport 2419 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2419 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2419' -Direction Inbound -Protocol UDP -LocalPort 2419 -Action Block

Related ports

2417composit-server2418cas2420dslremote-mgmt2421g-talk

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