I would like to inform you about an important change that affects all web server operators and possibly your HCL Domino Servers: The maximum validity periods of SSL/TLS certificates will be drastically shortened in stages.

Of course, I am aware that Windows 11 is not an HCL-supported operating system for the Domino or Traveler Server. Nevertheless - for example, I use Windows 11 VMs for my online courses and wanted to install the Traveler Server on this operating system.

In the middle of December I renewed the SSL certificate of one of my Domino servers (mobil.madicon.de) and subsequently started the obligatory SSL server test of Qualys SSL Labs. The rating of "A+" was OK, but the reference (marked with the red arrow in the screenshot) to the downgrade to "Grade B" from January 2020 was reported. Cause: my Domino server still supported TLS 1.0!