Hey,
I just read this article :
I followed the different steps :
IP, user, pwd + port, allow all certif + SSL.
I got this error : “Error during communication, check your connection”.
rutorrent/plugins/httprpc/action.php => return false
Any idea please ? 
— edit —
You can close, I was probably a bit tired and forgot this field : SCGI Mount point
My bad, sorry !