This is the string from the doit.log, the -%N0 appears at the later part, I
added it in the scan rules tab of the GUI as the faq says that's where
additional options should go.

-qwC2%Pns0u1%s%uN0%I0p3DaK0H0%kf2A999999%f#f -F "Mozilla/4.78 [en] (Windows NT
5.0; U)" -%F "" -%l "en, en, *" <http://thesitetobemirrored.com/> -O1
"E:\\mirror" -%N0 -s0 -%! +*.png +*.gif +*.jpg +*.css +*.js
-ad.doubleclick.net/* -*.onestat.*

I've tried doing it as a new mirror instead of continuing after changing the
options and it doesn't help either. Active connections is still 1, with the
occasional flash to 2.