A year ago with an old NC and NCP-version I had the HPB issue too. There I have found out, that a bug in NCP deleted in the nextcloud config.php the trusted domain. I know this is fixed now. Or since months…
Exactly today with the newest NCP and NC version on my Raspberry 4, i suddenly get disconnected in the andoird app. After checking: the HPB service is down. I tried restart apache, tried restart the PI, tried something like this:
sudo -u www-data php /var/www/nextcloud/occ notify_push:setup
sudo systemctl start notify_push
sudo systemctl enable notify_push
sudo systemctl restart notify_push
checked the config here:
nano /etc/systemd/system/notify_push.service
everything was ok and nothing helped. And suddenly the HPB service is up again. It is a mistery.
I found this disussion here:
This would be my next try.
But its working now again, and I don’t know why. So better do nothing and start to pray to all gods.