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Instronics and Muracu, that's a lot of very helpful information. (My only criticism is that there's no real connection between it and my easily misinterpreted comment about a "back door!")

Some...

gore, I should have stated that more clearly. I can "get in through a back door" by running a PHP script that lets me enter shell commands through a browser. It doesn't let me do anything without...

Some additional notes.

I looked up DNS poisoning, and it's certainly possible, but it's not clear how I'd diagnose it or fix it. I don't even know how to find out what DNS server would be...

Thanks for the suggestions. I'll respond as well as I can.

First, you're using some terms that I don't know (DNS poisoning, back shells), so not everything you said is clear to me. I can look...

I'm facing a security problem on my client's web sites, and need some advice.

Two sites have suffered a total of three security breaches over the past several months. In each case a PHP script in...