I am getting the same error:
The link harvest failed, make sure you have harvesting enabled in your options.
I have tried several configurations of the options and still get about 60 – 65 posts into the harvesting when it gives that error. Harvesting is enabled.
I upgraded to the latest version of WP, 2.1.1 and tried again with the same result.
This seems like it would be a great feature, so I’m pretty bummed that it isn’t working for me.
Suggestions?