Port 5671 (AMQP over TLS)

AMQP with TLS (RabbitMQ, Azure Service Bus, Azure Event Hubs).

Registered (user) port, 1024-49151 TCP Message queues Expose only to trusted sources

What port 5671 is used for

AMQP with TLS (RabbitMQ, Azure Service Bus, Azure Event Hubs).

Expose only to trusted sources. Use when clients connect from outside the network; still require credentials.

Service nameProtoDescriptionAssigneeReference

amqps TCP amqp protocol over TLS/SSL Ted Ross 2 -

amqps UDP amqp protocol over TLS/SSL Ted Ross 2 -

Registry dates for this port: registered 2008-03-26.

Linux: is anything listening on TCP 5671?

sudo ss -tlnp 'sport = :5671'

Linux / macOS: which process owns the port

sudo lsof -nP -i :5671

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':5671 '

Windows (Command Prompt)

netstat -ano | findstr :5671

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5671 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 5671

From Windows

Test-NetConnection HOST -Port 5671

Replace 203.0.113.10 with the address or network you trust. With ufw, make sure the default incoming policy is deny.

ufw (one trusted source)

sudo ufw allow from 203.0.113.10 to any port 5671 proto tcp

iptables

sudo iptables -A INPUT -p tcp --dport 5671 -s 203.0.113.10 -j ACCEPT
sudo iptables -A INPUT -p tcp --dport 5671 -j DROP

nftables

sudo nft add rule inet filter input ip saddr 203.0.113.10 tcp dport 5671 accept
sudo nft add rule inet filter input tcp dport 5671 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'TCP 5671 trusted' -Direction Inbound -Protocol TCP -LocalPort 5671 -RemoteAddress 203.0.113.10 -Action Allow

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