Due to you accessing port 2083, which is a secure port. Cpanel strongly recommend logging in over SSL. Logging in over an encrypted SSL connection will prevent your username and password from being transmitted in plain text over the Internet Neither is anything to worry about. Just tell your browser to go ahead and accept the certificate and proceed. You understand and accept "the risk" (which isn't any risk at all -- the browser is just trying to protect you from some common attacks).