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Port 5673 (jms)

IANA assigns port 5673 to jms: JACL Message Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
jms TCP JACL Message Server Stuart Allen -
jms UDP JACL Message Server Stuart Allen -

Registry dates for this port: registered 2002-02.

Check what is listening on port 5673

Linux: is anything listening on TCP 5673?
sudo ss -tlnp 'sport = :5673'
Linux: UDP 5673
sudo ss -ulnp 'sport = :5673'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5673
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5673 '
Windows (Command Prompt)
netstat -ano | findstr :5673
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5673 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5673
From Windows
Test-NetConnection HOST -Port 5673
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5673

Block port 5673 in the firewall

ufw
sudo ufw deny 5673/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5673 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5673 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5673' -Direction Inbound -Protocol TCP -LocalPort 5673 -Action Block
ufw
sudo ufw deny 5673/udp
iptables
sudo iptables -A INPUT -p udp --dport 5673 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5673 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5673' -Direction Inbound -Protocol UDP -LocalPort 5673 -Action Block

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5671AMQP over TLS5672AMQP (RabbitMQ)5674hyperscsi-port5675v5ua

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