Attention: Make sure to carefully check that your credentials and port number are correct for your auth type.

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HTTPS

How to authenticate using HTTPS.
HTTPS Port65535
curl --proxy https://network.joinmassive.com:65535 -U '{PROXY_USERNAME}:{API_KEY}' https://cloudflare.com/cdn-cgi/trace

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HTTP

How to authenticate using HTTP.
HTTP Port65534
curl --proxy http://network.joinmassive.com:65534 -U '{PROXY_USERNAME}:{API_KEY}' https://cloudflare.com/cdn-cgi/trace

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SOCKS5

How to authenticate using SOCKS5.
SOCKS5 Port65533
curl -x socks5h://network.joinmassive.com:65533 -U '{PROXY_USERNAME}:{API_KEY}' https://www.cloudflare.com/cdn-cgi/trace

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Firewalled Ports

If port 65,535 is closed on your network, try port 1,080.
Port1080
curl -x https://network.joinmassive.com:1080 -U '{PROXY_USERNAME}:{API_KEY}' https://cloudflare.com/cdn-cgi/trace