Why not surf the web online but you can use QQ Chat _ Web surfing

The author of the school campus network through optical fiber Internet, with a wave NP50 do Internet Connection Sharing server, the server's network card IP address as a gateway to other computers. As a result of the recent virus killing, the electronic preparation room has several computers infected with the virus, Internet upgrade anti-virus software, anti-virus, found that the infection is the same virus. Antivirus finished, there has been a strange phenomenon, that is, the killing of these few computers are not able to access the Internet. This phenomenon is the first time I encountered, look at the network card IP address, gateway, DNS address are correct. At this time, I found a teacher is unable to surf the internet on the machine chat. However, when you open a browser, you still cannot access the Web site. Why can't I open the Web page, but can chat with QQ? The author attempts to use SFC scan changed system files, check the process prompts C:\Windows\System under the Wsock32.dll file may be corrupted, select "Restore Files", from the Windows 98 installation CD to restore this file. After restarting the computer, finally can surf the internet! As a result, the virus causes system file Wsock32.dll to be destroyed, resulting in the machine can not be online.

Summary: Any TCP/ip-based application under Windows must access the network through the Winsock interface, Winsock provide a high-level data transfer programming interface unrelated to the underlying transport protocol. In Windows systems, use the Winsock interface to provide network access services based on TCP/IP protocol for applications. Now that the file is corrupted, of course, you can't surf the web. But why QQ can chat with Tencent? We know that communication on the Internet is based on the TCP/IP protocol, TCP/IP protocol is divided into two kinds of TCP and UDP, QQ is the use of UDP communication, and Winsock damage does not affect the normal transmission of UDP. This is precisely what this article said can not surf the Web page, but can chat with QQ reason.