500 Unable To Connect

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Originally Posted by cd34

Reverse DNS Lookups are used to prevent spoofing attacks on hostname based authentication. Disabling that is a matter between you and your host.

Short of some very specific cases, we haven't run Reverse DNS lookups on production sites due to the slight performance hit the first time a new surfer hits a site.

I haven't run reverse lookups on anything in years. While spoofing attacks are always of interest, lately my biggest battle has been with DOS attacks. All of the recent attacks I've dealt with have been from IPs that reverse. I've always considered the server load hit (particularly in a DDOS situation) from doing reverses too big.

-jbn