Base filtering engine or BFE is Windows service which is vital for NetLimiter 4's functionality. If it does not run then NetLimiter 4 can not work properly. Various important Windows applications including Windows Firewall are also dependent on BFE so it is highly recommended that you keep it running.
If you receive a notification that BFE is not running(for any reason), you should start it manually to keep your machine protected and NetLimiter 4 working...
Windows Servicesconsole by pressing Win+R (or Win+Q), typing services.msc and pressing Enter.
Base Filtering Engine, right-click it and select Start.