Your control panel is accessible via any of the following links:
https://servername:2083
https://yourserverip:2083
https://yourdomainname.com:2083
SSL Warning: You will see certificate warnings within your browser when accessing cPanel from any url's other than https://servername.com:2083.
To avoid those warnings, update any bookmarks to use the server name cPanel url as there is a legitimate SSL certificate installed on the canonical server name.The control panel runs on port 2083 so if you are behind a firewall or proxy server you might have trouble accessing your control panel if that port is blocked.
Unfortunately, there is no way around this and the only resolution is to talk to your Network Adminstration about opening up that port for you.