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pop up says firefox cannot find server for www.usacurl.org

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when I click on www.usacurl.org or on a link, the pop up says "Server not found

         Firefox can't find the server at www.usacurl.org.
 Check the address for typing errors such as
   ww.example.com instead of
   www.example.com
 If you are unable to load any pages, check your computer's network
   connection.
 If your computer or network is protected by a firewall or proxy, make sure
   that Firefox is permitted to access the Web.
when I click on www.usacurl.org or on a link, the pop up says "Server not found Firefox can't find the server at www.usacurl.org. Check the address for typing errors such as ww.example.com instead of www.example.com If you are unable to load any pages, check your computer's network connection. If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.

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Upgrade your browser to Firefox 9 and check

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Upgrade your browser to Firefox 9 and check

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I upgraded my browser to Firefox 9 and checked. No difference. This did not help. I still get the same server not found message.

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Clear the cache and the cookies from sites that cause problems.

"Clear the Cache":

  • Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"

"Remove Cookies" from sites causing problems:

  • Tools > Options > Privacy > Cookies: "Show Cookies"

A possible cause is security software (firewall) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.

Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.

See:

You can also try to reset (power off/on) the router.