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Some websites will insert bad DNS entries into your computer to keep you from accessing their websites, even if you begin using a VPN.  To fix this problem you need to flush your DNS cache after connecting to Castle VPN.

Windows:

ipconfig /flushcache

or:

ipconfig /flushdns

Mac OS X:

dnscacheutil -flushcache

If that still doesn't work, delete your web browsers cache and cookies, and possibly restart your computer, connect to Castle VPN and then try accessing the blocked website.

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