TLS 1.2. This protocol is an industry standard designed to protect the privacy of information communicated over the Internet. As of 04-09-2018 you will need to make sure you are using TLS 1.2. In Internet Explorer, you can check this by clicking on Tools, Internet Options. Go to the Advanced Tab and scroll down to the Security section and make sure TLS 1.2 is checked. If you require assistance please contact Central Operations at 858-432-7000.