Secure Sockets Layer (SSL) is a protocol used for secure data transfers and encrypted communication between web servers and browsers. To avoid receiving alerts or error messages when accessing the web interface, upload a Secure Sockets Layer (SSL) certificate from a trusted provider through Server Certificate or import a custom root certificate to your QNAP device. QNAP recommends you purchase a valid SSL certificate from myQNAPcloud SSL Web Service Certificate. For details, see myQNAPcloud website.