Are you getting a specific error message when trying to open the JAR? What version of Windows 10 (Home or Pro) are you running? Do you have other Java apps installed? UBNT Discovery Tool V2.5.1 and JAVA on windows 10

This article serves as your definitive guide. We will cover why v2.5.1 is still relevant, how to properly configure the dependencies, step-by-step installation on the latest Windows 10 builds, security exceptions, and advanced troubleshooting.

To run the discovery tool smoothly, you must align your Java version, environment variables, and network permissions. 1. Download the Correct Assets

A community-maintained fork of the Discovery Tool is available on GitHub. This updated version:

However, running this Java-based legacy tool on an updated Windows 10 environment in 2026 presents specific challenges. Modern security policies and Java updates can cause the tool to fail to launch or fail to detect devices.

With the release of and the latest Windows 10 updates, things have changed—for the better and the worse. Here is everything you need to know to get the tool running today .

To run the v2.5.1 discovery tool successfully, your environment must meet these updated requirements:

: While the tool can run on newer OpenJDK versions, Java 8 (JRE 1.8) offers the highest native compatibility with legacy Ubiquiti applets without requiring advanced security overrides. Download the x64 Windows installer from Oracle or Adoptium (Temurin). 2. Configure Windows Environment Variables

So your full command: %JAVA_HOME%\java.exe -XX:+UseParallelGC -Djava.net.preferIPv4Stack=true -jar UBNT_Discovery_Tool_v2.5.1.jar

Right-click the .jar file and select .