Enable HITCOUNT_HITS_PER_IP_LIMIT option only for anonymous users. Otherwise, if this setting is set, e.g. to 0.5, and several users are logging in from the same IP, only 1 hit per IP is counted. Now this check is performed only for anonymous users, so hits from different users, even from the same IP, will all be counted. Downside: if a user comes from IP, makes a hit, and then logs in and makes another hit, they both will be counted.