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Port 3424 (xtrms)

IANA assigns port 3424 to xtrms: xTrade over TLS/SSL.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
xtrms TCP xTrade over TLS/SSL Mats Nilsson -
xtrms UDP xTrade over TLS/SSL Mats Nilsson -

Registry dates for this port: registered 2002-02.

Check what is listening on port 3424

Linux: is anything listening on TCP 3424?
sudo ss -tlnp 'sport = :3424'
Linux: UDP 3424
sudo ss -ulnp 'sport = :3424'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3424
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3424 '
Windows (Command Prompt)
netstat -ano | findstr :3424
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3424 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3424
From Windows
Test-NetConnection HOST -Port 3424
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3424

Block port 3424 in the firewall

ufw
sudo ufw deny 3424/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3424 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3424 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3424' -Direction Inbound -Protocol TCP -LocalPort 3424 -Action Block
ufw
sudo ufw deny 3424/udp
iptables
sudo iptables -A INPUT -p udp --dport 3424 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3424 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3424' -Direction Inbound -Protocol UDP -LocalPort 3424 -Action Block

Related ports

3422rusb-sys-port3423xtrm3425agps-port3426arkivio

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