I enabled some rewrite rules to deny access to my site in case there is a referrer not from my webserver when posting comments in wordpress, or if there is some unwanted user agent when accessing any content.
Legitimate access is not supposed to be blocked, so if you notice a block, just send me an email and tell me exactly what you did (name of program, version, user agent string, how you accessed my site, which URL generated the error message, exact time (you better synchronize with NTP to make sure that your time is the same than my time) and timezone in UTC[+-]XXXX notation), so that I can investigate how to prevent the block.