cPanel already have an internal proxy that redirect you through the port 80 or 443 usually open to access any website.

If you are behind a firewall you can access cpanel, webmail, whm or webdav using the following url format:

https://cpanel.yourdomain.com

https://whm.yourdomain.com

https://webmail.yourdomain.com

https://webdav.yourdomain.com

Note when you access to any of those url's your browser can popup a warning about the SSL certificate, that is normal, just add an exception and you will be ok.
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