NSClient++

A simple, powerful, and secure monitoring agent for Windows and Linux. Works with Nagios, Icinga, Op5, Prometheus, check_mk — and anything that speaks NRPE, NSCA, NRDP, or REST.

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Why NSClient++

• Cross-platform — Windows and major Linux distros (details)
• Many protocols — NRPE, NSCA, NSCA-NG, NRDP, check_mk, Icinga 2, Op5, Graphite, Syslog, SMTP, REST, Prometheus/OpenMetrics
• Web UI with live dashboards and check explorer
• Scriptable in Python, Lua, or any external script
• Command line client — check_nsclient drives local and remote agents from a single binary
• Central management — NSClient Fleet configures a whole estate from one server
• Secure by default — TLS, client certs, allowed-hosts

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NSClient++

The monitoring agent, on every machine you want to watch.

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NSClient Fleet

One server that configures the whole estate.

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check_nsclient

The command line client for the agent’s REST API.

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Which file for which platform, the web UI bundle and the container image are all on the download page.

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Get started

• Quick Start — 10-minute walkthrough
• Installation guide — MSI options & silent install
• All downloads — agent, fleet server, command line client
• NSClient Fleet — manage every agent from one server
• Securing the agent — TLS & client certs
• Web Interface

Documentation

• Monitoring scenarios — common real-world setups
• Reference — every module & command
• Concepts — how it works under the hood
• check_nsclient — the standalone command line client
• FAQ

Community

• Forums
• Issues
• Donate via PayPal
• Sponsor on GitHub

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