You have all already been informed to change your old CA4 connections to CA4.1. The reason for this is the mandatory adjustments in the cryptoalgorithm, which provide for new, more secure algorithms for regulatory purposes. Almost all customers and partners have already responded to the requirement and switched over. A few conversions still have to be made - please note that 31.12.2022 is the last date and we will then switch off the old connections.