Part of mailing list point to an URL with an invalid certificate. I know this is nothing new and has been discussed/mentioned before (1). Code: pyra-handheld.com:1717 uses an invalid security certificate. The certificate is only valid for rhea.dragonbox.de. Scenario: 1. Go to https://www.pyra-handheld.com/pipermail/kernel/ 2. Click on "more information about this list" link 3. Opens "https://pyra-handheld.com:1717/virtualmin-mailman/unauthenticated/listinfo.cgi/kernel" I've ran into this previously and ignored the warning (added a temporary exception in Firefox). This is obviously not very nice and no no longer easy to do on some browser. When HTTP Strict Transport Security (HSTS) is used on a website, Firefox no longer allows to add security exception. While this is not urgent, I think it should be fixed. I am unsure why a different port (1717) is used. It could also be that there is another way to access that page that works (and only the link needs to be updated). I am willing to help with the web server (...) config if needed.