Nagios Support Forum

Hi, My old nagios server use NRPE its works to monitor local port but NCPA not, any solution. Thanks.

Hi @vtcedu,

You can actually monitor TCP/UDP ports directly in Nagios XI without the need for NRPE or NCPA using the TCP/UDP Port Wizard in XI.

The following document should be helpful to you: https://assets.nagios.com/downloads/nag ... ios-XI.pdf

I tried your suggestion but failed, my site firewall is blocking the Nagios server's port 22 to client. Is there any method to monitor the local open port?"

Try check_open_port

Hi @vtcedu,

If the functionality you are looking for from NCPA is missing, you can add plugins to the NCPA plugins directory, for example, /usr/local/ncpa/plugins.

kg2857 wrote: ↑Thu Jan 22, 2026 1:04 am Try check_open_port

would you provide more inforamtion such as the check_opern_port path.

lgute wrote: ↑Thu Jan 22, 2026 9:38 am Hi @vtcedu,

If the functionality you are looking for from NCPA is missing, you can add plugins to the NCPA plugins directory, for example, /usr/local/ncpa/plugins.

would you share any step to add NCPA plugins ?

@vtcedu,

You can find additional Nagios plugins or "checks" on the Nagios Exchange and GitHub.

Repositories for plugins

• https://exchange.nagios.org/directory/plugins/
• https://github.com/search?q=nagios%20pl ... positories

NCPA Docs

• https://www.nagios.org/projects/ncpa/#n ... umentation
• https://library.nagios.com/docs/nagios- ... -With-NCPA

You can also search this forum for more information.

I'm curious about what you mean by local open port. The nagios server can check for an open port on some other server. That other server can check if a local port is open, but that doesn't indicate that the port is open to a third server.