Hi,
But unfortunately it does not work for me, or with any proxy service, so it probably only works for you.
See this 3rd party proxy also returns 404 error:
– German proxy: https://i.imgur.com/UY3HS3T.png
– NL Proxy: https://i.imgur.com/51asfms.png
Is there any firewall or anything set up?
Feel free to test that URL on these proxy sites:
https://hide.me/en/proxy
http://german-proxy.de/