Can't use HA app on my phone anymore locally

I can’t use my HA app on my Android phone anymore. It used to work and then it stopped working all of a sudden, which prompted me to clear data and setup the app again, but it refuses to connect to my HA server now. I’m doing this all locally, so no DNS services or SSL certificates are involved. I read other posts here and couldn’t find any info that matches my problem. I can access the HA on my Personal PC just fine through browser. When I tap on the automatic discovered HA server on home, my screen goes blank. When I try to use the address manually, it gives me this Proxy hostname lookup failed.

Any help will be appreciated :blush: