I am running pcWRT Newifi-D2 v2.5.3 on a Windows 10 machine.
Previously, the Adblock Control button on the login screen turned on and off Adblock and indicated it with a change in the login screen Adblock button content. Recently, this has not been working (sorry, don’t recall what pcWRT version). I press the button and a blank screen appears. Then some time after that I get the “Bad Gateway” page.
I looked at the source of the blank page and have the following meta tag: <meta http-equiv=”refresh” content=”0; URL=/cgi-bin/pcwrt/adblock” />
When I apply the given URL to my pcWRT address, it goes directly to the “Bad Gateway” screen.