HTTP DDoS: “Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)”

Our servers were attacked recently by a constant stream of HTTP POST requests.  The requests were coming in from a large range of IP addresses, at a rate of about 5-10 per second, with random POST data.  However, all the requests had the same UserAgent, they always accessed the non-www form of the same domain, and . . . → Read More: HTTP DDoS: “Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)”