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I keep getting an error message that says server not found ad.doubleclick.net and that is it. What do I do to correct this problem.

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I keep getting a message that says Server Not Found ad.doubleclick.net and I don't know what to do about it. How do I correct this?

URL of affected sites

http://

I keep getting a message that says Server Not Found ad.doubleclick.net and I don't know what to do about it. How do I correct this? == URL of affected sites == http://

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This means that something is blocking that ad server from loading. Blocked ad servers can cause some sites to malfunction.

I would recommend using a different DNS server, as the one you have seems to block some sites. You can follow instructions for switching to OpenDNS to see if an alternate DNS fixes the problem.