QuickBooks Transport Layer SecurityError typically arises when there's an issue with the encryption protocol used for secure communication between the QuickBooks software and Intuit's servers. This error often occurs due to outdated TLS settings or configurations, hindering the connection process. Resolving it involves updating QuickBooks to the latest version and ensuring that TLS settings are compliant with the required standards, typically TLS 1.2 or higher, to maintain secure data transmission. https://www.errorsfixs.com/blog/quickbooks-transport-layer-security/