Untangle 15.1 Download ^new^ Direct

Upgrading from 15.0 to 15.1 triggers a kernel update and a mandatory database reindexing. For larger networks, this reindexing can take over an hour, during which the dashboard may be unavailable.

While newer versions like 17.x are available, specific 15.1.x installers are often sought for compatibility with legacy hardware or specific restoration paths. You can access official files through the NG Firewall Downloads Wiki : untangle 15.1 download

untangle-15.1.1-amd64.iso — Best for bare-metal installations on a dedicated PC or server. Upgrading from 15

Upgrading to the 4.19.0-4 Linux kernel improved driver support for modern network chipsets, including Intel X553 . You can access official files through the NG

The shift to Debian 10 brought substantial enhancements over the previous 15.0 (Stretch) release:

untangle-15.1.1-amd64.img — Used for writing to USB drives or SD cards for smaller appliances.