Priority Network Solutions

Details tab
Select https in Scheme
Turn on Websockets

Paste the below in Advance tab in npm

location / {
  proxy_pass http://youripaddress:80/admin/;
  proxy_set_header Host $host;
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_hide_header X-Frame-Options;
  proxy_set_header X-Frame-Options "SAMEORIGIN";
  proxy_read_timeout 90;
}
location /admin {
  proxy_pass http://youripaddress:80/admin/;
  proxy_set_header Host $host;
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_hide_header X-Frame-Options;
  proxy_set_header X-Frame-Options "SAMEORIGIN";
  proxy_read_timeout 90;
}

Solution: Uninstall unbound

sudo apt-remove unbound
In Pihole admin webinterface
Go to Settings
DNS tab
Check mark your preferred public DNS (eg.Cloudflare, Google)
Uncheck Upstream 127.0.0.1#5335
Save

Change the config.php file for the subdomain and ip address so that npm can work correctly. Use the actual ip address of the server.

/var/www/nextcloud/config
nano config.php

Look for the below
‘trusted_domains’ =>
array (
0 => ‘localhost’,
1 => ‘server1.example.com’,
2 => ‘192.168.1.50’,
3 => ‘[fe80::1:50]’,
),

https://tailscale.com/kb/1130/lxc-unprivileged
https://tailscale.com/kb/1019/subnets#connect-to-tailscale-as-a-subnet-router
https://tailscale.com/kb/1320/performance-best-practices#ethtool-configuration
https://www.cyberciti.biz/faq/download-install-ethtool-under-debian-ubuntu-linux/