The proxy servers of the China Channel Firefox Add-on seems to be out of order.
An alternative way of testing can be found here:Website Test behind the Great Firewall of Chinahttp://www.websitepulse.com/help/testtools.china-test.html
Here are some results from the above web page.
Tested From: Shanghai, China Resolved As: 208.80.152.2 Status: Empty reply from server Response Time: 0.414 sec
Tested From: Beijing, China Resolved As: 208.80.152.2 Status: Empty reply from server Response Time: 3.595 sec
Tested From: Hong Kong, China Resolved As: 208.80.152.2 Status: OK Response Time: 2.696 sec
Tested From: Seattle, WA Resolved As: 208.80.152.2 Status: OK Response Time: 1.678 sec
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