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I am looking at my Apache access log and there is suspicious activity from several ip ranges. What they have in common is that all of them are identified as "Allegro-Software-WebClient/4.07".

Is there a way for me to create a rule for apf or similar that will do:

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up vote 1 down vote accepted

For a firewall to do this, it has to support HTTP protocol inspection which is not supported by most firewalls (if not all). Firewalls usually inspect lower layers.

I suggest to install a proxy like squid in front of apache. The, you can configure it to deny access based on the user-agent (called browser in squid).

acl aclname browser [-i] regexp ...

The proxy server helps also in caching and thus improving your server performance.

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