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Tamsy - 4:32 am on May 20, 2003 (gmt 0)
I am using RewriteCond %{HTTP_REFERER} ^-?$ [NC] in combination to block only cases where the UA AND Referer are empty "-" to avoid blocking innocent visitors (i.e. who are using an old version of Norton Internet Security which hides the UA). Works well for me :-)
Hi WIZ
RewriteCond %{HTTP_USER_AGENT} ^-?$ [NC]
RewriteRule .* - [F,L]