Port 9092 KAFKA
Port 9092 is most commonly used by Kafka. The IANA registry lists TCP / UDP for this number.
What is port 9092 used for?
Port 9092 is most commonly used by Kafka. Apache Kafka brokers commonly listen on port 9092; the IANA registry lists XmlIpcRegSvc for this number. 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 XmlIpcRegSvc connects to port 9092. 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 9092 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: [Casey_Harrington].
Check and block port 9092
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 = :9092'
sudo ss -ulpn 'sport = :9092'Check on Windows
Get-NetTCPConnection -LocalPort 9092 -State Listen -ErrorAction SilentlyContinue
Get-NetUDPEndpoint -LocalPort 9092 -ErrorAction SilentlyContinueBlock with UFW
sudo ufw deny 9092/tcp
sudo ufw deny 9092/udpBlock with iptables
sudo iptables -A INPUT -p tcp --dport 9092 -j DROP
sudo iptables -A INPUT -p udp --dport 9092 -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.
Is port 9092 safe to expose?
Kafka brokers may accept unauthenticated clients when security is not configured. Enable SASL/TLS and restrict network 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 9092 is usually used
Most traffic on port 9092 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 9092.
- Local development brokers running in Docker with a published port.
List Kafka topics
kcat lists broker metadata without producing or consuming messages.
kcat -b 127.0.0.1:9092 -LCommon problems with port 9092
Connection refused or timed out
Refused usually means the host is reachable but nothing is listening on port 9092. 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 = :9092' or sudo lsof -i :9092. 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 9092 at a glance
| Port number | 9092 |
|---|---|
| IANA service name | XmlIpcRegSvc |
| Commonly used by | Kafka |
| Transport protocol | TCP / UDP |
| Category | Message queues and streaming |
| Range | Registered port (1024–10000) |
| Risk level | Medium |
| Registered assignee | [Casey_Harrington] |
| Registry description | Xml-Ipc Server Reg |
| Source | IANA Service Name and Transport Protocol Port Number Registry |
Frequently asked questions
What is port 9092 used for?
Port 9092 (KAFKA). The IANA registry lists TCP / UDP for this number. Apache Kafka brokers commonly listen on port 9092; the IANA registry lists XmlIpcRegSvc for this number.
How do I check if port 9092 is open?
On Linux run `sudo ss -tlpn 'sport = :9092'` and `sudo ss -ulpn 'sport = :9092'`. On Windows run `Get-NetTCPConnection -LocalPort 9092 -State Listen -ErrorAction SilentlyContinue` and `Get-NetUDPEndpoint -LocalPort 9092 -ErrorAction SilentlyContinue` in PowerShell. If the port is open, the output shows a process listening on port 9092; empty output usually means nothing is bound to it.
How do I block port 9092?
With UFW run `sudo ufw deny 9092/tcp` and `sudo ufw deny 9092/udp`. With iptables run `sudo iptables -A INPUT -p tcp --dport 9092 -j DROP` and `sudo iptables -A INPUT -p udp --dport 9092 -j DROP`. Persist the iptables rules with your distribution's netfilter-persistent or iptables-save tooling so they survive a reboot.
Is port 9092 safe to expose?
Kafka brokers may accept unauthenticated clients when security is not configured. Enable SASL/TLS and restrict network 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.
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Primary data: IANA Service Name and Transport Protocol Port Number Registry.
Last reviewed 2026-10-30 · Methodology · About · Privacy