Can't reach LuCI on dumb AP after configuring guest WiFi

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@outi

I am sure since I'm looking at it when connecting directly via ethernet cable

then it's a firewall setting... or web browser
see:

Can't login in LuCI with normal browser

Hi, I'm quite new to openWRT, I just reseted my router to start fresh, entered a new password, and now I can't login on a normal browser tab, no "wrong password" prompt or anything it just goes back to the password prompt but on a Private browsing tab it works just fine..works ok with SSH as well... I tried reseting my router twice already and still have the same issue ... I'm running a YouHua WR1200JS (also known as MTK MT7621A with a fresh install of the 19.07 firmware ... So if you know wh…

Luci stopped working

Thank you guys. @lleachii you were right from the beginning the problem was that I didn't properly understand. After applying the steps given by @DjiPi it was clear for me what was wrong: it's not the same a WAN port than a LAN port. So my bad for not getting @lleachii's answer from the beginning. Still I prefer @DjiPi's answer because it's more explicit, and contains more info for newbies like me, that's why I marked it as the solution. Now LuCI is working for me again. My first problem is…

but I notice this so you managed to access "lights"

192.168.1.2:80          192.168.1.100:52358     ESTABLISHED 1799/uhttpd