Here’s a clean, informational text block you can use for documentation, a guide, or a forum post regarding Ubiquiti Discovery Tool v2.5.1 and Java on Windows 10:
Step 2: Run as Administrator
Once the correct Java version is installed:
- Firewall blocking: Windows Defender Firewall blocks Java’s raw socket permission. Go to
Allow an app through firewall→ Addjavaw.exe→ Allow both Private and Public. - VLAN separation: The tool only discovers devices on the same VLAN. Connect directly to a trunk port or native VLAN.
- WinPcap missing: Although v2.5.1 uses raw sockets by default, some builds require Npcap. Install Npcap 1.79 in "WinPcap API-compatible Mode."
- Right-click
ubnt-discovery-tool-2.5.1.exe→ Properties → Compatibility → Change High DPI settings. - Check "Override high DPI scaling behavior" → Select System (Enhanced).