This error message indicates that the server name that you entered does not match the name that appears on the server's certificate.
You might have caused this by entering the secure server's IP address when the DNS or NETBIOS name appeared on the server's certificate. If this occurs, it can appear as if you are being maliciously redirected to a server other than the one to which you had intended to connect.
To avoid seeing this message in the future, connect to the server by entering the address that appears on the secure server's certificate.