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timeout was 2 seconds.

14 254 ms 254 ms 254 ms 72.21.222.157


Name: twitter.com
20 * * * Request timed out.
DNS request timed out.

5, keyword-based TCP connection reset
original article as reproduced, amuse specify: Reprinted from moonlight blog [
5 10 ms 15 ms 14 ms 61.152.86.58

we see, www. SomeRandomDomainName.com This ought be a non-existent domain name, DNS server ought acquaint us the domain name does not exist, but we see the DNS server tells us the IP of the domain name 218.83.175.155 (114 searches in different parts of the IP is different, is not likely to get the IP 218.83.175.155, but their area of ​​114 search server IP address), and this IP is 114 searches the IP, resulting in the browser when you visit this site to see the 114 quest page.

write these 2 together because in both cases is the external declaration is the same. However, there is a mammoth difference and IP blocking. IP blocking IP is the last one up in China, and IP filtering firewall server and the server break final up to IP is abroad. For instance, we do get 75.101.142.137 test, deployed on top before the alexa website, immediately has no server on this IP (can be seen as the server is down):
3, IP blocking


First we set the alien appoint server to clear the DNS hijacking problem. We look behind the diagnosis was dropbox domain name is the DNS pollution:


* reference one: the United States
here is the IP block refers to the foreign server's IP added to the blacklist system, resulting in maximum parts of the country or can not directly access the server. Because the system is dispensed, so there may be some zones you can access some areas can not access the situation. Such as the now-famous Cloud warehouse services Dropbox home page,tods mens, the IP is creature blocked.
Not on the external network, how to determine the domain name and domain name hijacking pollution



over a maximum of 30 hops:

we see the correct DNS server told us the domain name does not exist, we will not be hijacked to 114 search.
timeout was 2 seconds.

1 25 ms 18 ms 18 ms 58.35.240.1
19 * * * Request timed out.










If you absence apt solve the DNS hijacking problem, you can put your own DNS waiter transmit abroad, such for OpenDNS (watch moonlight blog blog




we saw last up to IP is 75.101.160.35, and then we check the IP who is it:

If you need to verify the DNS domain name has been tainted and not the other faults, we must premier know, DNS hijacking is done by the country's domain name servers, so we replaced the foreign name server can resolve the problem; The DNS poisoning is done by the system, so even now the replacement of the domain name server, the system can still send forged DNS results replace the correct analytical results. So we can not exist by using a foreign name server IP as we analyze what is the DNS hijack or DNS poisoning. We are still using the nslookup network diagnosis, select a non-existent foreign IP is 144.223.234.234:

To resolve IP blocking, we can only through encrypted proxy, VPN, or the use of loopholes in the system to access the site.
3 10 ms 15 ms 14 ms 124.74.37.9
as DNS hijacking can be replaced by the DNS server to resolve the problem as foreign, so the system needs to use DNS poisoning to block some of the domain name. Thus, even with the foreign name server can not server the correct IP, it will not be able to access the server. Such as the now noted progenitor twitter micro-blog on the home page was a DNS poisoning.
we see, www.SomeRandomDomainName.com does not return results, then it is not DNS poisoning.
* Reference data 2: King County, Washington, USA Seattle, Amazon
Obviously, this is a server failure.


and stateless TCP connection reset, as https is encrypted because the data transmission protocol, the system can not know what the https protocol transmission content, but does not allow people to use https to access As the https transmission, SSL certificate is transmitted in the clear, so you can monitor damaging SSL certificate published to the specified domain name. If so, then forced open a TCP connection, the browser will display Filtering occurs only in the SSL certificate to access the site when using https.


Name: www.SomeRandomDomainName.com




Server: ns-pd.online.sh.cn
Address: 144.223.234.234
*** Can't find server name for address 144.223.234.234: Timed out

4, server, firewall, IP filtering and server downtime
this correlate address:
Server: UnKnown
DNS request timed out.


*** Request to UnKnown timed-out
16 270 ms 270 ms 273 ms 216.182.224.22
4 49 ms 59 ms 12 ms 124.74.209.129

15 250 ms 250 ms 249 ms 216.182.232.53
timeout was 2 seconds.



Tracing route to 75.101.142.237 over a maximum of 30 hops
DNS request timed out.



1 18 ms 19 ms 26 ms 58.35.240.1

*** Can't find server name for residence 144.223.234.234: Timed out

precisely for of the http protocol namely transmitted in the remove, so the TCP linkage can be reset based above keywords. So if the site supports encrypted https way https access via our website, so as to solve the problem. However, whether the site does not patronize https access, we can merely encrypted surrogate, VPN, or the use of loopholes in the system for a visit. And the servant system to deal with https is not without additional means of. In adding to IP blocking, there is not state of TCP connection resets, SSL certificates, filtering, SSL hijacking and additional method, to every in corner beneath.
* Reference data 2: Shanghai Telecom



8 * * * Request timed out.
12 * * * Request timed out.

2 25 ms 42 ms 27 ms 58.35.240.1


https connection disconnected notwithstanding people can discourage access to Based on this, for https weaknesses (believe all certification authorities CA), CNNIC apply to become a leading certificate authority (Root CA), which can issue artificial certificates medium aggressions, which break the contents of https transport. See Moonlight blog



HTTP session hijacking is to modify the regular http return results in which you can add advertising, or even a virus Trojan. The common Internet advertising has been added http session hijacking, it is possible that the site's own ads. Since the http protocol is transmitted in the clear, http session hijacking can be done also. Moonlight blog, HTTP session hijacking is usually an ISP to shove the implementation of advertising, but does not rule out the future of this tool will be used by the system.




* site main data: Shanghai Telecom
11 279 ms 280 ms 278 ms 67.14.36.6



9, HTTP session hijacking
10 215 ms 179 ms 175 ms 63.146.27.133
7, SSL certificates percolate
* reference one: Shanghai Telecom


*** google-public-dns-a.google.com can't detect www.SomeRandomDomainName.com: Non -existent domain
This article procreated from moonlight blog: Original name:
2 15 ms 20 ms 29 ms 58.35.240.1

7 * * * Request timed out.



8, SSL hijacking
*** Request to UnKnown timed-out





timeout was 2 seconds.
stateless TCP connection to reset the browser to display the result is To resolve this problem, agents can only rely on encryption, VPN, or use the loopholes in the system.
Address : 144.223.234.234



C: > nslookup www.dropbox.com 144.223.234.234
1, DNS hijacking
Clearly, the problem here in Shanghai Telecom (other zones may be areas of local telecommunications), preferably than the dropbox servers.
DNS apply timed out.
resolved to use nslookup to find us repeatedly look by the web site:
SSL certificate filter case is relatively small. If you need to solve this problem, agencies can only depend on encryption, VPN,tods moccasins, or use the loopholes in the system.
If you need to verify whether DNS hijacking in the environment, we can use the Windows command line cmd that comes with Windows Network Diagnostics tool nslookup to find a domain name does not exist or unstable for approximately network diagnostics :



Address: 202.96.209.133
Non-authoritative answer:

timeout was 2 seconds.


Server: UnKnown




Address: 93.46.8.89
domestic system in the people through the http protocol to access foreign Web sites will record all the contents of the accident some of the more keywords, they will force a TCP connection is disconnected, record either IP and maintained for a time of period (1 minute), our browsers will display the After this period of time (1 minute), and the server's IP as we retard the system records the subject, we can not re-visit this site. We must stop visiting this site, visit again after a period of period without these keywords page, you can visit this site.

To resolve DNS pollution, we can use a variety of encryption for remote DNS resolution proxy, VPN, or use the loopholes in the system.
4 14 ms 14 ms 15 ms 124.74.209.137
18 * * * Request timed out.



in the domestic Internet environment, we often encounter network problems are: DNS hijacking, DNS pollution, IP blocking, server, firewall, IP filtering, server downtime, keyword-based TCP connection reset,buy tods online, no state of TCP connection resets, SSL certificates, filtering, SSL hijacking, HTTP session hijacking and other network problems. Here I turn to illustrate:
C: > nslookup www.SomeRandomDomainName.com 144.223.234.234
6 * * * Request timed out.
Server: google-public-dns -a.google.com
general people in China are introduced over a network failure, students can distinguish between the different fault and resolve it?
your ask IP: 61.152.86.58
9 171 ms 170 ms 173 ms 202.97.50.54




Because of these characteristics, we have been based on keywords to determine if the TCP connection to reset the position easier. If the explorer displays word of the TCP connection reset failure.
if SSL is being hijacked, difficult to find. Our access to foreign sites through https when a certificate must check whether each country's certification authority. If the domestic certification authority, then it may have been hijacked with SSL, you must now stop to visit.





https is encrypted because the data displacement protocol, the system can not know what the https protocol transportation content, yet does not allow human to use https access to forced loosen the TCP connection. In this course, these websites https protocol can not be instantly accustomed in the country, numerous people were coerced to use http protocol to transfer entire the contents are recorded in the system.
we have seen, not as 144.223.234.234 there should be no return. But we get a erroneous IP: 93.46.8.89. We then test the IP just to be DNS hijacking situation:
Tracing route to www.dropbox. com [174.36.30.70]
DNS request timed out.

SSL if you absence to solve the abduction, we can work to the browser such as CNNIC, as against the domestic certification authority's certificate (such as But this does not solve the problem, if 1 daytime one unknown country in the SSL certificate authority hijacking is laborious to find. Ultimately, we also need to rely on encryption proxy or VPN.

Address : 144.223.234.234
we see, the last IP is 61.152.86.58 (not the same in different parts of the IP), then do not pass, and apparently was in the vicinity of the IP 61.152.86.58 blockade. Then we open ip138 check who is in control 61.152.86.58:
Address: 8.8.8.8
7 14 ms 15 ms 14 ms 202.97.34.126

6 10 ms 14 ms 15 ms 202.97.35.154


to solve the HTTP session hijacking, moonlight blog, also attempts a Solutions - Advertising using the browser plug shielded part of the problem can be resolved, we can not completely solve the problem. If you want to solve the HTTP session hijacking techniques, one reach is to use encryption proxy and VPN access to all sites, including domestic, but not solve the problem, if the HTTP session hijacking is in the server close the router settings, which usages can not solve; Another reach is for a alter HTTP session hijacking our way through the brush and then kidnap your router's firmware behind (dd-wrt and tomato router firmware to support custom, may be capable to kidnap the HTTP session and then behind to the incipient data), or for another HTTP session hijacking, the use of different local advertising petition layer filtering proxy server.

17 272 ms 269 ms 289 ms 75.101.160.35


Source: reader submission. Author Twitter: @ davidsky2012, authors Google Reader: https://www.google.com/reader/shared/lehui99
6, stateless TCP connection reset
3 13 ms 10 ms 14 ms 124.74.20.45
C: > nslookup www.SomeRandomDomainName.com

timeout was 2 seconds.
... ...

timeout was 2 seconds.


DNS request timed out.
we all know, the Internet in China will meet a diversity of different pretended network failure, so we can not normally access many sites. However, many people are not familiar with the network, which constantly can not discriminate among different network failure, network failure led to obviously, but that is a server failure; or apparently a server failure, network failure, but that is the case. I feel the need to explain the different characteristics of a network failure, and the distinction between them and the methods to solve them.
13 249 ms 249 ms 244 ms 72.21.199.40
C: > nslookup twitter.com 144.223.234.234


DNS request timed out.
*** Can't find server name for address 144.223.234.234: Timed out
Address: 218.83.175.155
C: > nslookup www.SomeRandomDomainName.com
your query IP: 75.101.160.35
* site master data: United States
C: > tracert-d www.dropbox.com


8 194 ms 195 ms 194 ms 202.97.51.138
DNS distinctly not been polluted. So afterward we can not filter ICMP protocol network environment (some residential broadband and some of the company's internal web filtering ICMP, can not use the tracert), we can use the Windows mandate line bat that comes with Windows Network Diagnostics tool tracert for network diagnosis is what the IP was blocked sites or other failure:




Server: UnKnown

5 14 ms 14 ms 14 ms 61.152.86.142
However,tods drivers women, as the So then, I will tell DNS poisoning.

C: > tracert-d 75.101 .142.237
2, the domain name pollution


DNS hijacking will lead us access to some non-existent or unstable site,tods outlet, access to telecommunications is 114 search (see moonlight blog