Maybe I have missed this from someone else, but one important thing about the whitelisting message:
“This device is not allowed to access your mirror.
Please check your config.js or config.js.sample to change this.”
The EXACT SAME message appears (in my case) if the config.js has syntax errors. Locally your mirror will tell you that there is no config file or just give you a black screen, but if you try to reach it from outside through a browser (Firefox and Chrome in my case) with a broken config.js, you will get the whitelisting message above.
So, before trying to get your ipWhitelist in the right shape, make sure you have no other syntax errors with the mirror, e.g. using
npm run config:check
If you had some and had them corrected, be safe and restart the mirror.
Below you can see the example in my case.
pi@magicmirror2:~ $ tail ~/.pm2/logs/mm-out-0.log
No helper found for module: helloworld.
All module helpers loaded.
Starting server on port 8080 ...
Server started ...
Connecting socket for: updatenotification
Sockets connected & modules started ...
Launching application.
Access denied to IP address: 66.249.93.64
Access denied to IP address: 80.157.5.50
Access denied to IP address: 80.157.5.50
pi@magicmirror2:~ $ cd MagicMirror/
pi@magicmirror2:~/MagicMirror $ npm run config:check
> magicmirror@2.1.2 config:check /home/pi/MagicMirror
> node tests/configs/check_config.js
Checking file... /home/pi/MagicMirror/config/config.js
Line 260 col 9 Expected ']' to match '[' from line 26 and instead saw '{'.
Line 261 col 16 Expected '}' to match '{' from line 11 and instead saw 'module'.
Line 261 col 22 Missing semicolon.
Line 261 col 16 Unrecoverable syntax error. (95% scanned).
pi@magicmirror2:~/MagicMirror $ sudo nano config/config.js
pi@magicmirror2:~/MagicMirror $ npm run config:check
> magicmirror@2.1.2 config:check /home/pi/MagicMirror
> node tests/configs/check_config.js
Checking file... /home/pi/MagicMirror/config/config.js
Your configuration file don't containt syntax error :)
pi@magicmirror2:~/MagicMirror $ pm2 restart mm
Use --update-env to update environment variables
[PM2] Applying action restartProcessId on app [mm](ids: 0)
[PM2] [mm](0) ✓
┌──────────┬────┬──────┬─────┬────────┬─────────┬────────┬─────┬──────────┬──────┬──────────┐
│ App name │ id │ mode │ pid │ status │ restart │ uptime │ cpu │ mem │ user │ watching │
├──────────┼────┼──────┼─────┼────────┼─────────┼────────┼─────┼──────────┼──────┼──────────┤
│ mm │ 0 │ fork │ 901 │ online │ 6 │ 0s │ 18% │ 2.3 MB │ pi │ disabled │
└──────────┴────┴──────┴─────┴────────┴─────────┴────────┴─────┴──────────┴──────┴──────────┘
Use `pm2 show ` to get more details about an app
pi@magicmirror2:~/MagicMirror $
