HA worked now stopped no idea why

Installation
1

Not sure if this right location in the forums, apologies if is in wrong location.
I was using HA quite happily for months and then it stopped working.
It is running on a Pi 4. It was a few weeks ago so I do not remember what exactly triggered the drop. If was a system update or other?
I can see the HA Pi running but when I try to open it I receive the message 'Cannot Connect to Server"
To try to fix I have:

  1. refreshed the SD card with the latest Pi Imager
  2. actually tried a different Pi machine
  3. Moved the Pi to plug directly into router
    I can see the device on my router. I can ping the IP address. I have connected it to a monitor and the device is working. I can see network info and see the IP address it is using (matches my router)
    I am not aware of any changes to my home network. I do not have any router level controls running.
    Interestingly I have been able to run it from my Synology NAS. I do not want to use that due to BLE/Zigbee USB and other reasons. I want it on the Pi. But I can get it working without issue (minus the Zigbee).
    It seems fine except for the actual connection. I have tried connecting via PC, iPhone App, iPad App, it is all the same “Cannot connect to server”
    I have run ha update core and ha update docker on the Pi.

Any ideas?

Thanks

2

So, did you try http://ipaddress:8123 , ipaddress being the IP address it is using ?

3

yes tried http://ipaddress http://ipaddres:8123, home assistant.local; home assistant.local:8123
I get the error message ‘Cannot connect to server’ no matter which I try
And same through iPhone and iPad app

4

Can you access http://xx.xx.xx.xx::4357 , replace xx.xx.xx.xx with the being the IP address it is using ?

5

I was able to access the:4357. Then the whole thing worked and then I moved it back to where I need it to be and… it does not work. At this point it’s clear it is not a HA issue nor a network issue.

I am looking towards SD card now Eventhough I used a different one.

It has to be machine related. I guess.
Thanks for the help