I had someone get into my main server and put iframe redirects on my error pages. This was back when I was getting hacked about every month. I still don't know what exploit they used, got some ftp data and only targeted about 10 sites every time. Finally had my server admin restrict access to that server to my IP address only and no problem since. Got flagged by Norton, Google and McAfee but every thing went away after I cleaned the sites.
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