QuickBooks Online will no longer support Internet Explorer TLS that is, the Transport Layer Security setting of TLS 1.0 or TLS 1.1. This requires an Internet Explorer setting of the TLS 1.2  readiness tool. This will result from your access to QuickBooks Online only if you access it through Internet Explorer. If you are using other web browsers such as Google Chrome, this does not apply. TLS 1.2, is an internet security protocol, which is becoming a security standard for the industry.