As of 1 June 2021, the Financial Administration has ceased to support the TLS 1.1 encrypting protocols and selected codes of the TLS 1.2 protocol, which serve for communication of a cash register with the income part of the EET system.

Entrepreneurs, who continue to send data about their revenues to the Financial Administration despite the obligation of recording e-sales being postponed, thereby need to make sure that their cash registers support higher versions of TLS 1.3 encryption protocols and safe codes of the TLS 1.2 protocol.