Port 5672 AMQP
Port 5672 is the IANA-assigned amqp port for AMQP (TCP / UDP / SCTP).
What is port 5672 used for?
Port 5672 is assigned to amqp and uses TCP / UDP / SCTP. The IANA registry describes the service as “AMQP”. It sits in the registered range, the block used by databases, application servers and developer tooling. Port conflicts here are common when several local services start at once.
Ports are the transport-layer address a service listens on. A client that wants to reach amqp connects to port 5672. A TCP connection is refused when nothing is listening, while a UDP request simply goes unanswered. That is why a port conflict appears whenever two processes try to bind the same number.
Use the commands below to confirm whether port 5672 is actually in use before you change firewall rules. Blocking the port stops new inbound traffic at the firewall, but it does not stop a local process from listening, and it does not remove the service from the machine.
Browse all Message queues and streaming ports
Source: IANA Service Name and Transport Protocol Port Number Registry. Registered assignee: [Pieter_Hintjens].
Check and block port 5672
Copy-ready commands for the protocols assigned to this port. Run the check first, then block only what should not be reachable.
Check on Linux
sudo ss -tlpn 'sport = :5672'
sudo ss -ulpn 'sport = :5672'
sudo ss -Slpn 'sport = :5672'Check on Windows
Get-NetTCPConnection -LocalPort 5672 -State Listen -ErrorAction SilentlyContinue
Get-NetUDPEndpoint -LocalPort 5672 -ErrorAction SilentlyContinueBlock with UFW
sudo ufw deny 5672/tcp
sudo ufw deny 5672/udpBlock with iptables
sudo iptables -A INPUT -p tcp --dport 5672 -j DROP
sudo iptables -A INPUT -p udp --dport 5672 -j DROP
sudo iptables -A INPUT -p sctp --dport 5672 -j DROPThese commands are examples for a typical host. Check the listener before you change firewall rules, and persist iptables rules with iptables-save or netfilter-persistent. On Windows, use Windows Defender Firewall or New-NetFirewallRule for persistent blocks. The iptables rules here cover IPv4; mirror them with ip6tables if IPv6 is enabled. UFW and the built-in Windows cmdlets cover TCP and UDP only; this port also lists SCTP, so use nftables, iptables or the vendor's diagnostic tool for those protocols. SCTP and DCCP handling also depends on kernel support, including their diagnostic modules, so a missing result may mean the module is not loaded rather than that nothing is listening.
Is port 5672 safe to expose?
AMQP brokers commonly expose queues and management data and may allow default credentials. Change defaults, require TLS and restrict access. Expose this port only when the service is actually needed. Keep it patched, prefer an encrypted alternative, and limit source addresses with a firewall allowlist.
Where port 5672 is usually used
Most traffic on port 5672 falls into these scenarios. The demo below is a safe way to confirm the listener before you change anything.
- Producers publishing events and consumers subscribing to topics or queues.
- Microservices decoupling background work through a broker on port 5672.
- Local development brokers running in Docker with a published port.
Probe the AMQP listener
A TCP probe tells you whether the broker is reachable before you debug virtual hosts or credentials.
nc -vz 127.0.0.1 5672Common problems with port 5672
Connection refused or timed out
Refused usually means the host is reachable but nothing is listening on port 5672. A timeout more often means a firewall drop, a wrong host or a service bound to a different interface.
Port already in use
Find the process holding the port with sudo ss -tlpn 'sport = :5672' or sudo lsof -i :5672. Stop that process or configure it to bind another port; killing it without identifying it can take down a production service.
Firewall rule did not survive a reboot
UFW and Windows Firewall keep rules across restarts. Raw iptables rules do not: save them with iptables-save or the netfilter-persistent package, and re-apply after upgrades that reset the ruleset.
The port is blocked but still reachable
A firewall rule filters inbound traffic; it does not close the listener. Confirm with the check command above and bind the service to 127.0.0.1 when only local clients need it.
Port 5672 at a glance
| Port number | 5672 |
|---|---|
| Service name | amqp |
| Transport protocol | TCP / UDP / SCTP |
| Category | Message queues and streaming |
| Range | Registered port (1024–10000) |
| Risk level | Medium |
| Registered assignee | [Pieter_Hintjens] |
| Registry description | AMQP |
| Source | IANA Service Name and Transport Protocol Port Number Registry |
Frequently asked questions
What is port 5672 used for?
Port 5672 (AMQP) uses TCP / UDP / SCTP. AMQP.
How do I check if port 5672 is open?
On Linux run `sudo ss -tlpn 'sport = :5672'` and `sudo ss -ulpn 'sport = :5672'` and `sudo ss -Slpn 'sport = :5672'`. On Windows run `Get-NetTCPConnection -LocalPort 5672 -State Listen -ErrorAction SilentlyContinue` and `Get-NetUDPEndpoint -LocalPort 5672 -ErrorAction SilentlyContinue` in PowerShell. If the port is open, the output shows a process listening on port 5672; empty output usually means nothing is bound to it. UFW and the built-in Windows cmdlets cover TCP and UDP only; SCTP needs nftables, iptables or the vendor's diagnostic tool.
How do I block port 5672?
With UFW run `sudo ufw deny 5672/tcp` and `sudo ufw deny 5672/udp`. With iptables run `sudo iptables -A INPUT -p tcp --dport 5672 -j DROP` and `sudo iptables -A INPUT -p udp --dport 5672 -j DROP` and `sudo iptables -A INPUT -p sctp --dport 5672 -j DROP`. Persist the iptables rules with your distribution's netfilter-persistent or iptables-save tooling so they survive a reboot. UFW covers TCP and UDP only; use iptables or nftables for SCTP.
Is port 5672 safe to expose?
AMQP brokers commonly expose queues and management data and may allow default credentials. Change defaults, require TLS and restrict access. Nevertheless, expose this port only when the service is actually needed. Keep it patched, prefer an encrypted alternative, and limit source addresses with a firewall allowlist.
Related ports
- Port 5671 · amqpsamqp protocol over TLS/SSL
- Port 5677 · questdb2-lnchrQuest Central DB2 Launchr
- Port 6667 · IRCClassic IRC server port (community convention); modern IRC deployments…
- Port 5670 · zre-discLocal area discovery and messaging over ZeroMQ
- Port 6697 · ircs-uInternet Relay Chat via TLS/SSL
- Port 5298 · presenceXMPP Link-Local Messaging
Primary data: IANA Service Name and Transport Protocol Port Number Registry.
Last reviewed 2026-10-30 · Methodology · About · Privacy