Cannot enable FastLane in EX3700

Hi, I'm having problems enabling FastLane for my extender. I do everything as written in the manual but after choosing FastLane Technology option in Do More-FastLane section of mywifiext and clicking Save I only get "This site can't be reached" in my browser and FastLane doesn't seem to be enabled. I tried both 2.4GHz - 5GHz and 5GHz - 2.4GHz options with the same effect.

Any idea what could be the problem? I have the latest firmware version of V1.0.0.84_1.0.56.

Thanks.