The UBNT Discovery Tool v2.5.1 was built on the Java Runtime Environment (JRE). In the years since its release, Java has become less common on consumer PCs due to security concerns, and Windows 10 does not include it by default.
If you must use v2.5.1, community members have identified specific ways to get it running: Downgrade Java : The tool is confirmed to work with Java 8 Update 271 or earlier. Some users have success with Java 7 JDK or specifically the Hotspot runtime of OpenJDK v8. Portable Java (No Global Install)
It often fails on modern JREs (Java 11+). Many users report success only with Java 8 Update 251 or older versions like JRE 7 .
Why Ubnt Discovery Tool v2.5.1 Requires Specific Java Versions ubnt discovery tool v2.5.1 and java on windows 10
Do not let it install to Program Files (x86) if you have UAC issues. Instead, manually set:
If you have Java 8 or newer installed, uninstall it. This prevents path conflicts. Don’t worry—you can reinstall later.
Are the target Ubiquiti devices on the as your Windows 10 PC? Share public link The UBNT Discovery Tool v2
: Open Windows Defender Firewall settings, click Allow an app or feature through Windows Defender Firewall , locate Java(TM) Platform SE binary , and ensure both Private and Public network checkboxes are ticked. Tool Freezes or DPI Scaling Disorients the UI
I can provide exact firewall rules or terminal commands based on your network setup. Share public link
Ubnt Discovery Tool v2.5.1 and Java on Windows 10 The Ubiquiti Device Discovery Tool (v2.5.1) is a legacy desktop utility used to find UniFi, airMAX, and EdgeMAX devices on a local network. Because this software relies on Java, running it on Windows 10 often triggers compatibility errors, missing runtime alerts, or application crashes. Some users have success with Java 7 JDK
javaw -Xmx512m -jar ubnt-discovery-tool-2.5.1.jar
To make the tool run as smoothly as on Windows 7:
Have a different experience with Java 11 or Windows 11? Join the Ubiquiti Community forums and share your configs. Reliable networking depends on shared knowledge.
Under System variables , look for , select it, and click Edit .