I have enabled:
Anyone can register
Users must be registered and logged in to comment
I have now disabled:
Attempt to notify any blogs linked to from the article (slows down posting.)
Allow link notifications from other blogs (pingbacks and trackbacks.)
And I have disabled “Allow Pings” for each of my posts. But I never had anything defined in “Send trackbacks to:” for any of my posts in the first place.
So how did comments get entered without the user registering or logging in?