Very frequent "Server not found" messages

Posted by Village on Super User See other posts from Super User or by Village
Published on 2011-11-21T08:45:02Z Indexed on 2011/11/21 9:57 UTC
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internet-connection

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pppoe

Recently, while browsing and clicking or typing an address, I get: "Server not found", "Connection was reset", or a half-loaded page. Usually the page loads instantly after clicking reload, but this means I must reload on every page. Images on one site, but stored at a different server don't load until reloading for a second time. Clicking "submit" on many sites frequently doesn't work unless I reload many times. Sometimes sites load, but without colors and formating, appearing as if they would in Lynx. This seems to happen with every Web site.

My Internet service claims everything on their end is fine.
This happened a day after running an update in aptitude.
I have not updated any hardware.
I have tried clearing Iceweasel's cache.
I do not have any router or other equipment.

What could be going on? How can I troubleshoot this?

PPPoE connection, Iceweasel 3.5.16, Debian 6

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