Hi, I can no longer reach the HA (raspberryPI) web UI. Neither with http://homeassistant.local:8123, http://homeassistant:8123 nor with 192.168.1.50:8123.
No matter whether PC, tablet, cell phone or other browser. Restarting (HA and router) didn’t help. I started it on a different network to check and everything works fine there!
There must be a problem on my network. Can somebody help me please?
Has something changed in your network? New router or new router firmware? Is the IP address still correct?
IP is correct. No changes, only the HA core is updated.
Chrome says the website is not secure, EDGE says it doesn’t have a certificate.!
The browsers always warn you if you are not using https. That is a security feature. Turn on logging for http, restart HA and check the logs.
https://www.home-assistant.io/integrations/logger/
Can you reach the observer 
?
How can I edit the configuration.yaml? Directly on the PI from the console?
No, none works.
If you can use add-ons that the easiest way is to add the file editor add-on.
But I can’t access the web UI! So I can’t use any add-ons.
I’ll try it at work this evening. Everything worked there. I will adapt the logger and install and set up smb and ftp so that I can access the logs at home.
One more question: can you ping 192.168.1.50 ?
Yes, it works