Excessive access from external source, using an empty / blank user_agent string; via multiple IP addresses.
Legitimate web browser traffic would normally communicate various standard user agents to Apache.
Solution: Use .htaccess to block empty user_agent as follows…
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RewriteEngine on# BEGIN block access for empty user agents - 403 errorRewriteCond %{HTTP_USER_AGENT} ^$RewriteRule ^(.*)$ - [F,L]# END block access for empty user agents |
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