Xenolan answered Thursday July 5 2012, 11:33 am: That depends entirely on the nature of your internet connection and is not something which can be answered without knowing a great deal more about it.
If you are unable to access these sites, but ARE able to access others, then they are probably being blocked deliberately. Changing your proxy server is unlikely to make a difference; the network traffic must still come through the same local router, and the sites will still be blocked (unless whoever programmed the router is clueless).
If this is your home network and you have not set up such blocks, contact your internet service provider and troubleshoot with them. [ Xenolan's advice column | Ask Xenolan A Question ]
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