Patrick,
The version 3.1-2.v7 is the version that I am testing right now and (hopefully) it is that version that is released very soon. You have the released version which is still 3.0-1 .

Forgot to say, since you updated the /var/domoticz/server_cert.pem file you will need to restore it if you want to use the "domoticz standard SSL cert". should do the trick I guess.

If you need to use the "customized SSL" option after the upgrade, the file to edit is /var/domoticz/server_cert_custom.pem

/Fred