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exasperatedly yours...
I found this link after my website just disappeared one day a few months back. I couldn't even connect to my site when I typed my domain into my browser. All I kept getting was an error message or the page couldn't be found.
I contacted my hosts tech dept and they told me they connected to my site without any problems, which just compounded the craziness! After going back and forth with the tech dept, they told me to contact my isp because they believed that this was an isp filter issue.
What I found was much more than an ISP filter issue. My ISP's (without naming anyone - a large DSL provider) security department actually banned the ip address that I was on, along with the entire ip range, because of known e-mail spamming from some sites on that range! I have never engaged in e-mail spamming and supposively my host claims that no one on that ip range was spamming.
The result was that literally overnight, I could no longer connect to my site or to any sites on that ip range via my isp. But it didn't stop there, somehow my friends cable isp provider also picked up the banned ip range and within 24 hours, he also could not connect to my site or to any of the other sites that I knew were on that ip range via his isp.
I really felt that this was just some horrible nightmare. Within one week, I also lost about half of my indexed pages on Google and Yahoo. Could all of this been related? I really don't know! But, I do know that when I switched hosts and placed on a different ip, I have had no further problems and all of my lost idexed pages came back.
That experience was probably the strangest I have ever experienced. I would never have imagined that my isp provider could caused such a domino effect. One last thing, my ip address wasn't on the above list, but it was a starting point for me.