Dear all
I have recently exchanged the previous SSL certificates that were signed with a DAS-NETZWERKTEAM CA certificate for with new certificates signed by Let's Encrypt.
Additionally, all HTTP requests, with the limitation of accessing Jenkins directly, should be getting automatically redirected to a HTTPS location.
This measure fixes the annoying "insecure connection" errors.
Of course, previous HTTPS connections were never truly insecure - the CA certificate just was not trusted by browsers.
If you encounter trouble accessing Japsand-based services like the wiki, please file a bug report with X2Go BTS[1].
Mihai