Ensure Windows Firewall is not blocking the tool, as it needs to listen for broadcast packets to find devices on your network. Recommended Modern Alternatives
The tool only works on the local network segment. Ensure your computer is connected directly to the same switch/network as the UBNT devices. Issue 2: "Java Virtual Machine" or "Fatal Exception" Errors
Download the tool from the official Ubiquiti Downloads page (under the "Software" tab, look for the Java-based Discovery Tool) or a reliable archive.
: Windows 10 frequently blocks the discovery packets (UDP) used by the tool. You must ensure that both the Java runtime and the Discovery Tool have explicit permissions in the Windows Defender Firewall. Installation & Execution Guide UBNT Discovery tool and new Java | Ubiquiti Community ubnt discovery tool v251 and java on windows 10 updated
If you do not want to deal with Java installations on a modern Windows 10 machine, Ubiquiti has moved away from the standalone JAR file.
Once you have the tool working on your updated Windows 10 machine, keep these tips in mind:
If you tried installing the old v2.4.x version on a fresh Windows 10 build, you likely saw: Ensure Windows Firewall is not blocking the tool,
: 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
The UBNT Discovery Tool requires Java to run on Windows 10. Java is a popular programming language that allows developers to create platform-independent applications. The UBNT Discovery Tool uses Java to provide a cross-platform compatible utility that can run on various operating systems, including Windows, macOS, and Linux.
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. Issue 2: "Java Virtual Machine" or "Fatal Exception"
The tool requires an older Java Runtime Environment (JRE 8 or JRE 7) to function correctly.
Follow this exact workflow. Deviations—especially using the wrong Java version—will cause failure.
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During the installation wizard, check the box labeled . Complete the installation and reboot your operating system. Step 3: Extract and Isolate the UBNT Tool
The tool needs to know exactly where Java lives. Windows updates can corrupt these system paths.