China is rejecting all websites in one of my server ?
I discovered that all websites hosted on 67.15.xxx.xx are rejected by China , and I have a new customer that 80 % of his traffic, is chinese .. anyway.... firewall is not blocking chinese IPs.. and DNS is resolving very well for lot of countries, except china.. This is happening only in this server..
We had this issue in the past that we had to start assigning chinese customer's their own IP.
One of the reason was for "adult content" which for some reason china dont like!
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There is nothing you can do about the China problem. It's sad, I know, but that's just the way it is.
China blocks at DNS level, and IP level. But the most sad thing is that China's firewall actually does filtering of http headers. If the httpd headers contain a flagged keyword then the connection is dropped.
Let's say your site is not blocked. And your IP is not blocked. And China doesn't like the word foo. Now, if someone goes to your website and asks for yoursite.tld/foo/ then the visitors connection is dropped. Actually, it doesn't even matter if /foo/ exists, because the connection is just dropped. For example, you are not allowed to read about Falun Gong. So if you go to ANY website from China and ask for somesite.tld/Falun_Gong.html then the connection is immediately dropped by sending reset packages to both ends and somesite.tld is flagged for review - then maby they start blacklisting it by IP/DNS, maby not. This is actually very interesting in other context also: China does the keyword filtering in real time. It doesn't matter if their firewall knows about your IP or site - http content is scanned in real time and the connection is immediately dropped if a page which contains forbidden keywords. My point here is that this filtering is likely done in many other countries too, but without dropping the connection. Perhaps other countries just log when you view pages with flagged keywords.
As for the China problem: Accept that China is a country with a firewall, and you can't do anything about it. You can play the new-ip-game, where you can change IP and maby have your site available for a few weeks at a time until the IP is blocked and you need to move to a new IP, but that doesn't help much if/when they block your DNS (you just get a servfail when looking up your DNS in China).
No ISP/hosting company can help you. It's just the way Internet is in China..
Yep, it is a bad Great Firewall, except it's not really one Great Firewall at all, exactly how much of the outside is censored varies from ISP to ISP. The ISPs are basically told "don't embarrus us", and that's the whole summary. There is quite a bit of country-level censoring going on, but it also varies alot depending on where you are, what ISP you choose, and so on.
Why does this _have_ to work from this particular IP?
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The government is like that.. when i was there.. I could not access to wikipedia, myspace facebook, or anything that is against the Chinese Government policy, this includes the mention of China past evil deeds(like Wikipedia did) or any sensitive Taiwan-China relations, or siding too much on the US side for US-China relations... and of course freedom of speech and pornography.. even Youtube are banned.