What is the problem?
I have two octoprints, and I can't connect to my raspberry pi on my main pc. All other PCs work fine.
What did you already try to solve it?
I've tried manually setting the WIFI band to 2.4 since my router is a dual-band automatic, but there was no option to. Made sure nothing is blacklisted on my router. I'm assuming the pi is connected to the 2.4. I've tried connecting to the hostname through chrome on multiple devices. They all work when connecting to ender3pro2.local. I've switched the same sd card to a different raspberry pi and it's the same issue, so it's possibly an sd card issue? I've also reinstalled my motherboard's wifi's latest drivers as well as restricting it's access to only 2.4ghz.
Have you tried running in safe mode and if so did it solve the issue?
Actually gets worse in safe mode, all of my pcs cant access it.
Additional information about your setup
Octoprint lastest version, using a raspberry pi 3 a+, on an ender 3 pro