Today we've released UTM 9.601. The release will be rolled out in phases.
In phase 1 you can download the update package from our FTP server, in phase 2 we will spread it via our Up2Date servers.
WAF: TLS session tickets facilitate clients to speed up repeated TLS handshakes by re-using certain cipher parameters. This re-use of cipher parameters can cause encrypted connections to be less secure by impacting their perfect forward secrecy. To improve the overall security of the product, TLS session tickets are no longer enabled by the WAF.
Wait for 9.602! Support wrote today, that RED issues should be fixed there!