If you are getting errors when trying to comment, check out this site:
http://codex.wordpress.org/Enable_Sending_Referrers

particularly this section:

http://codex.wordpress.org/Enable_Sending_Referrers#How_do_I_Enable_Sending_Referrers.3F

Having referrers turned off will trigger the anti-spam thing in Wordpress and you won’t be able to comment at all.

Sorry.