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When i browse my website that host on HostGator got following error. Friends from other country said they can browse my site. Is that ISP error?

Network Error (tcp_error)

A communication error occurred: ""
The Web Server may be down, too busy, or experiencing other problems preventing it from responding to requests. You may wish to try again at a later time.

For assistance, contact your network support team. 
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up vote 3 down vote accepted

This message looks exactly like the default error messages of a Bluecoat proxy server. So most probably the proxy server that you use can't access the website. To determine a more specific reason you'll need to check (or have checked) the proxy logs.

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+1 for defining the source of this error message as "Bluecoat". – wfaulk Apr 10 '14 at 19:37

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