Cannot open Grafana

Good Morning all,
I’ve been struggling with this problem since yesterday morning. I updated to Grafana 8.50. Now I no longer have access to my Grafana interface via port 3000. Then I went back one version, I think to 8.4.7, but I still can’t get to the Grafana interface. I’ve been searching Google for hours but haven’t found a solution.
My Grafana.ini is configured like this:
allow_embedding = true

[auth. anonymous]
enabled = true
org_name = Main Org.
org_role = Viewer

allow_sign_up = false

When I type “systemctl restart grafana-server” I get this:
pi@homebridge:~ $ systemctl restart grafana server
==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-units ===
Authentication is required to restart ‘grafana-server.service’.
Authenticating as: , (pi)
pi@homebridge:~ $ sudo service grafana-server start

But Grafana is still unavailable.

That’s why I hope for your help now.

open issue here: