Port 10051: Zabbix server
Port 10051 is the default Zabbix server port, used both for agents sending trapper items and for the server itself. It pairs with the agent port 10050 to make up the standard Zabbix monitoring stack.
| Port number | 10051 |
|---|---|
| Service | Zabbix server / trapper |
| Protocol | TCP |
| Category | Management |
| Default encryption | No |
How do I check whether port 10051 is open?
Port 10051 carries TCP, so a connection either completes its handshake or it does not, which makes the check definitive.
| Question | Command | What to know |
|---|---|---|
| Is it open on a remote host? | nc -vz example.com 10051 | A TCP handshake either completes or it does not, so netcat gives a definitive answer in one line. |
| Same check on Windows | Test-NetConnection example.com -Port 10051 | Built into PowerShell. TcpTestSucceeded in the output is the answer; telnet is not installed by default on modern Windows. |
| What is listening locally? | ss -tlnp | grep ':10051 ' | Lists the process bound to port 10051 on Linux. On macOS use lsof -nP -iTCP:10051 -sTCP:LISTEN, on Windows netstat -ano | findstr :10051 |
Replace example.com with the host you are testing. A blocked port and a port with nothing listening on it look identical from the outside, so if a service should be running, check locally before blaming the firewall.
Frequently asked questions
What is port 10051 used for?
Port 10051 is the default Zabbix server port, used both for agents sending trapper items and for the server itself. It pairs with the agent port 10050 to make up the standard Zabbix monitoring stack.
Is port 10051 TCP or UDP?
Port 10051 (Zabbix server) uses TCP.
Is port 10051 secure?
Port 10051 is not encrypted by default. Where possible, use an encrypted alternative or tunnel it over TLS or a VPN.
Should I open port 10051 on my firewall?
Only if you specifically need Zabbix server. Expose it to the smallest set of trusted sources, and never open database or Windows-service ports to the whole internet.