Hi,
http://wagthedoguk.wordpress.com/ is my wordpress site.
I tried as you asked.
1. I first un-installed Jet pack on http://www.wagthedoguk.com
2. Then I un-logged myself out of wordpress.com
3. re installed Jet Pack
4. Tried to connect ...same response
5. logged into wordpress
6. tried to connect again...same response.
Jetpack worked fine on http://www.wagthedoguk.com/blog
since changing directories it does not.
Thanks!