Why does my binding for Fritz!Box not work with HTTPS?

[Nuesel (Daniel)]

I have a similar issue here:

FritzBox SSL communication

By the way, the operating system (Ubuntu) is able to create a trusted SSL connection: openssl s_client -connect myfritzbox.domain:.443 -> Verify return code: 0 (ok) I also added my CA to /var/lib/openhab2/etc/keystore. I’m not sure, if this is the correct place for storing it. But due to my limited knowledge in Java, I don’t have any idea where else to put this CA. Similar issue here: