You will be redirected to the ssl/tls (secure) ports when visiting URLs like http://domain.com/cpanel/, http://domain.com/webmail/, http://domain.com/whm/, etc.
You will receive an SSL certificate error warning, which can be ignored. The warning is received because we have Self-Signed SSL Certs installed for all servers. This is acceptable in our case because we're not using SSL for its second purpose - resource authentity verification. SSL is used only for encryption of traffic, containing critical data.