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This thread may be of some help.
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If you've your own server, you[r'e] able to change your log output to hide the 403's
I would never omit something entirely; I want to know who tried. Or at least have the option of knowing, if I need to check later.
Instead of "403" it logs "client denied by server configuration:".
Thanks for the link to the other WebmasterWorld thread. But with insiders and experts talking back and forth like that, I wasn't able to understand most of it. So I'm going to start searching around on the web again to see if I can find anything.
Did you ever try setting
There are excellent blacklists that identify troublesome IPs.
[edited by: incrediBILL at 5:19 pm (utc) on Jun 27, 2014]