What does it mean when a domain name is blocked? How to solve the problem when a domain name is blocked?
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A domain name is blocked, which means that it is blocked by the Great Firewall (hereinafter referred to as (GFW)), also known as the Chinese firewall or the Chinese national firewall. The reason why a domain name is blocked may be that the website under the domain name has too much illegal information or sensitive content, which does not comply with domestic laws and regulations; the website space used is a foreign space, and the IP address is foreign; if no rectification is made, the domain name will be blocked by the GFW. Although the domain name resolution is normal at this time, it may cause domestic or foreign domain names to fail to access.
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Domain name is intermittently blocked
If it can be opened intermittently, and it can be opened with a foreign proxy when it cannot be opened, it means that the domain name is intermittently blocked (of course, this situation may also be caused by unstable domestic DNS resolution). If there is illegal information on the website under the domain name, it will be temporarily unavailable, and it can be opened again after a while. It is generally judged as intermittent blocking. The solution is to delete the sensitive information entry keywords.
IP is blocked
If ping fails, it can be opened with a foreign proxy, which generally determines that the IP is blocked. Note: Generally speaking, if the address of your domain name resolution is abroad, it will be blocked. If it is bound to a domestic IP, it will not be blocked.
1. If you find that a domain name is blocked, it is best to resolve the domain name immediately and do not keep it on your server.
2. Most domain names are blocked because there are too many illegal keywords on the website, causing the "Great Firewall" on China's international exit to intercept the information of this domain name. Therefore, even if you change the domain name many times, there is still a risk of being blocked. The fundamental solution is to install a keyword interception system on your server to intercept sensitive words, so that your site will not be blocked again. If you do not install a keyword interception system, you need to rectify the website content and check whether the relevant keywords violate the regulations. If you cannot check it yourself, the best way is to redo the website to ensure that the domain name will not be blocked in the future.
3. How to determine whether a domain name is blocked: it cannot be accessed in China, but it can be accessed abroad. You can use an online web proxy to test it.
4. Collateral impact of blocked domain names: After each visitor visits a blocked domain name, he will not be able to visit other sites on the same IP within 5-20 minutes. If the blocked domain name is always resolved to a certain IP, the entire IP will eventually be blocked.
National Firewall
The primary designer is Fang Binxing, the former president of Beijing University of Posts and Telecommunications, who is known as the "Father of the National Firewall". Based on this system, the country can block any illegal website outside our mainland, making it inaccessible to the country. And the domain name we are talking about is blocked, in layman's terms, the domain name is blacklisted by the national firewall, or the website IP is blacklisted in the GFW.
Common blocked objects
GFW most commonly blocks domain names, and rarely blocks IPs. Unless the IP is seriously in violation. And the disadvantages of blocking IPs are too great. In addition to the possibility of accidentally damaging other websites with the same IP, the blocked website only needs to change its IP. Therefore, the current mainstream is to block domain names. The symptoms of being blocked by GFW are: once it is detected that the URL access address initiated by a domestic IP contains a domain name in the blacklist, a certain disconnection mechanism will be triggered to disconnect the access. At the same time, within a few minutes, the access initiated by this domestic IP to other websites where the IP of the blacklisted domain name is located will also be interrupted. After a few minutes, if no access is initiated to the domain name that is not in the blacklist, the mechanism will not be triggered.
What is a domain name blocked? How to solve the problem of a domain name being blocked?
(1) The IP of the domain name resolution is included in the blacklist
In this case, you just need to change the IP to normal, but changing the IP can only solve the urgent problem temporarily. Once it is discovered by GFW again, it is very likely that the domain name will be directly blocked. Therefore, it is recommended that you take the initiative to remove illegal content on the website
(2) The domain name is included in the GFW blacklist
In the case of excluding IP/DNS hijacking, the domain name is included in the GFW database. However, you can solve the problem of being unable to access the website by climbing over the firewall, changing domestic servers or using domestic forwarding servers.
(2) DNS hijacking
More careful webmasters may find that sometimes when a website is opened with China Telecom broadband, it will jump to other pages, but when it is opened with China Mobile or China Tietong, it is normal. This is very likely to be DNS hijacking. Now there are also many illegal elements who hijack through third-party DNS. Therefore, while eliminating problems with China Telecom and China Mobile, you should also analyze whether the third-party DNS you use has any abnormalities.
How to determine whether a domain name is blocked
(1) AiZhan detection
Therefore, determining whether a domain name is blocked has become a key node. To determine whether it is blocked, the simplest way is to use two types of lines, domestic and foreign. Under the condition of ensuring that the domain name resolution is normal, if the access fails, but the foreign line access is normal, it is very likely that the domain name has been blocked by GFW due to illegal information. Of course, not everyone has a foreign network. In this case, you can find some websites that provide domain name blocking detection services and test it online. For example, the author often uses a webmaster tool platform called "AiTOOL" www.aitool.cc, which is quite convenient for detection.
(2) gfwgfw.com query
In the absence of external software support, we use the CMD command tracert to determine whether the domain name has been blocked. If a timeout occurs during the judgment process, it is very likely to be blocked. However, such judgment is extremely objective. Tracert can only determine the domain name that has been resolved, and cannot determine some domain names that have not been resolved or are not registered. So how do we judge these unresolved domain names? The editor searched the Internet for half a day and found a website gfwgfw.com that specializes in querying GFW. Through this website, it is easy to determine whether the new and old domain names, whether they have been resolved or not, have been blocked.
What should I do if the domain name is blocked?
If the website is blocked, it is best to solve the problem immediately, because its impact may affect a wider range. For example, initially only the website domain name may be blocked, but if the domain name is always resolved to a certain IP, it will eventually cause the entire IP to be blocked. Moreover, if the domain name is blocked because the website has illegal information, then even if the domain name is changed many times without rectifying the network content, the website is still in danger of being blocked.
Solutions:
(1) Move the blocked domain name to China, use domestic servers, and register;
(2) Bind a new domain name to the server, use a domestic forwarding server, redirect the blocked domain name to the new domain name, and transfer the weight of the original domain name to the new domain name by setting 301 and full site forwarding.
(3) Resolve the domain name to a large domestic site (such as Baidu, etc.), which may be unblocked after a few days;
(4) Check the website information, clean up sensitive content, and the website content must comply with domestic policies and regulations.
(4) Ultimate solution:
a. Apply HTTPS encryption for the website to prevent being blocked; b. Carefully check the content of your own website, delete illegal or sensitive information, and make a law-abiding website.
Regarding domain name blocking, in addition to the above-mentioned methods of remedying the situation, from various sources, there is basically no solution to domain name blocking, especially for some gray area websites, unless you use a domestic host, because as long as you pass through the wall, it will be reset. If you use a domestic host, it will be reset when accessed from abroad. You can have a host in China and one in foreign countries, and resolve it according to the line...
Domaincn.com Committed to providing fair and transparent reports. This article aims to provide accurate and timely information, but should not be construed as financial or investment advice. Due to the rapidly changing market conditions, we recommend that you verify the information yourself and consult a professional before making any decisions based on this information.