Guess you could go into settings /etc/enigma2/settings and if you can find the correct constant, you should could manually set it. (You would have to stop the receiver (putty -> login -> init 4) and then copy to the PC, update with notepad+ (Linux editor) copy back and then in putty restart (init 6)Reflashed. I went into openwebif it let me enable https i saved witht the green button.
Went back in as soon as i enabled "authentication for streaming" and tried to save again and exit it went back to "https enabled no"
Its a puzzling one this.
