Reasons and solutions to the system's inability to access the Internet

Windows operating system network has been such a problem, the author on the internet to see a lot of people are asking this question, so put some of their own experience to combine some examples to tell us about the Windows system encountered no Internet problems should do?

Software class issues

1, Vista can not access the Internet

The solution to this problem is simple, if your taskbar has a broadband connection icon (bad) then you can at the beginning (that is, the shutdown button above), there is a control panel, into which you can have an icon (icon style: Four PCs under a cable connection, the Chinese version is "Network Center "), into which he, on his left, has six options select the Sixth option (Manage network connections), enter, you will find two computer graphics, the first icon on the right button, select the bottom of the Properties button, in the pop-up box to find the words with Tcp/ipv4, point him, and then point him below ( There are three buttons in the last button that is the attribute, where you can adjust your IP address, tuned OK. Connect broadband to the top of the control surface version of the beginning, you can connect broadband.

2. Windows 2003 cannot surf the internet

1), open Registry Editor, delete the following two keys in the registry (before removing the best lead out of the backup):

Hkey_local_machinesystemcurrentcontrolsetserviceswinsock

Hkey_local_machinesystemcurrentcontrolsetserviceswinsock2

2, in the system directory of the INF directory to find Nettcpip.inf file, open, find:

[Ms_tcpip. Primaryinstall]

; TCPIP has properties to display

characteristics = 0xa0; NCF_HAS_UI ncf_not_user_removable

Change the 0xa0 here to 0x80 save exit (this setting is to allow users to modify the TCP/IP protocol)

3, open the "local Connection" properties--install--Add a protocol--from disk installation, find the Nettcpip.inf file just saved, press "OK", back to the list, select the last "Internet Protocol (TCP/IP)" (left no icon, note not that " Microsoft TCP/IP version 6 "), will prompt for no digital signature, press OK to install.

After this step, and return to the Network Connection window, this time, select "TCP/IP", the "Uninstall" button is already available (not done before this step is gray). Click the Uninstall button to remove the TCP/IP protocol and restart the machine.

4, restart, the Nettcpip.inf file, and then follow the 3rd step, reinstall a TCP/IP protocol (at this time it will not be prompted no digital signature, hehe).

5, the installation of a good agreement after the restart, reset the "local Connection" connection properties, you can network, if not, then restart again, hehe.

I deeply think that the problem is due to my hard disk aging, resulting in TCP/IP protocol related data corruption, so I hastened to the hard drive ChkDsk, hehe.

3. Windows XP does not have access to the Internet

I found that one of the most easily Windows XP is unable to access the Internet, many people have encountered such a problem, and do not know how to deal with, someone even had to reload the system, in fact, it is not difficult to solve the problem, first check the network connection does not have any icon to explain the problem. The Device Manager can find the explanation that the NIC exists. Initial judgment is the network card contact bad. First, check the Wire crystal Head and network card contact is firm. Second, check the network card and whether it is plugged in, it is best to plug it again. Mainly look at the following two aspects:

1 Some people are connected with the problem, such a good solution, as long as in the IE tool--internet option-Open the Connection tab click Settings, re-enter the password after the confirmation. Problems with the browser itself

When IE browser itself fails, it will naturally affect the browsing, or IE can be malicious modification of the damage will also cause the Web page can not be browsed. At this point you can try to use "Huangshan ie repair Experts" to repair (recommended to the Safe mode of repair), or re ie (such as reinstall IE encountered can not be repeated problems, can refer to: a solution can not reload IE)

4), the network firewall problem

If the network firewall is not set up properly, such as high security level, accidentally put IE into the block access list, the wrong firewall policy, and so on, you can try to check the policy, reduce the firewall security level or directly turn off the test is back to normal.

5), network protocol and Nic-driven problems

IE can not browse, there may be network protocol (especially TCP/IP protocol) or network card driver damage caused, can try to reconnect the network card driver and network protocol.

6), Hosts file issues

The Hosts file is modified, will also cause the browsing is not normal, the solution is of course, the contents of the Hosts file empty.

7), System documentation issues

When the system files related to IE are replaced or damaged, it will affect the normal use of IE, you can use the SFC command to repair, WIN98 system in "Run" in SFC, and then perform a scan; Win2000/xp/2003 performs a sfc/scannow attempt to fix it in "run".

In which only IE can not browse the Web page, and QQ can be on, it is often due to winsock.dll, Wsock32.dll or Wsock.vxd (VxD only in the Win9x system exists), such as file damage or loss caused, Winsock is constituted tcp/ IP protocol is an important part of the general need to reload the TCP/IP protocol. However, XP began to integrate the TCP/IP protocol, so it is not easy to uninstall and reload as 98, and you can reset the TCP/IP protocol by using the Netsh command to revert to the state of the operating system when it was first installed. The specific actions are as follows:

Click "Start", enter "CMD" command in the Run dialog box, pop-up Command Prompt window, then enter "netsh int ip reset c:resetlog.txt" command will return to, where "resetlog.txt" A file is a log file used to record the results of a command execution, which must be specified, and the full path of the log file specified here is "C:resetlog.txt". Executing this command results in the same effect as removing and reinstalling the TCP/IP protocol.

Tip: The netsh command is a command-line-based scripting tool that you can use to configure and monitor Windows systems, and it also provides an interactive network shell interface, which is used in the format of the Netsh command, see the Help file (enter "netsh/?" in the prompt window). can be).

The second workaround is to fix the above file, Win9x use SFC to extract the above files, win2000/xp/2003 use the Sfc/scannow command to repair the file, and when Sfc/scannow cannot be repaired, Try the online release of the repair tool specifically for this issue winsockfix.

8), through the bat file to solve the Internet problem

Close all network-related programs first, then click Start Menu-> Run

Input: regsvr32 urlmon.dll

Open IE input a commonly used Web site to see if you can access, if the OK, if not yet, the following command to save 321.bat

regsvr32 Urlmon.dll

regsvr32 Shdocvw.dll

regsvr32 Msjava.dll

regsvr32 Actxprxy.dll

regsvr32 Oleaut32.dll

regsvr32 Mshtml.dll

regsvr32 Browseui.dll

regsvr32 Shell32.dll

Then run 321.bat this file

This should be OK.

9), Application Management Service problems

There can only be on the QQ can not open the Web page situation, restart after the good. However, even if the restart, open 7 to 8 pages after the page can not open, only on QQ. Sometimes telecommunications will allow you to disable Application Management service, you can solve. The specific reason is unknown.

10), anti-virus software real-time monitoring problems

This is not often seen, but sometimes it is related to real-time monitoring, because now the anti-virus software real-time monitoring has added to the content of the Web page monitoring. Give an example: KV will be on the individual machine will cause IE can not browse the Web page (many friends have encountered), its specific performance is to open the Web page monitoring, a boot on the internet about 20 minutes later, IE will not be able to browse the Web page, then if the KV2005 of the Web site monitoring turned off, everything back to normal; The KV2005 can not be solved after completely reloading. Although not install KV each machine will appear this problem, after all, the system of each machine is different, the installation of the program is not the same. However, if IE can not browse the Web page, but also pay attention to the anti-virus software to check.

11, there is also a phenomenon needs special attention: is to open the homepage of the website, but can not open the level two link, if so, the processing method is to re-register the following DLL file:

In Start-run ENTER:

regsvr32 Shdocvw.dll

regsvr32 Shell32.dll (Note this command, first do not lose)

regsvr32 Oleaut32.dll

regsvr32 Actxprxy.dll

regsvr32 Mshtml.dll

regsvr32 Urlmon.dll

regsvr32 Msjava.dll

regsvr32 Browseui.dll

Note: Press ENTER for each entry. The second command does not need to lose, after the completion of these commands restart Windows, if found invalid, and then re-enter again, this time enter the second command. Also, if it's a 98 system, downloading the file to Microsoft's Web site may be easier,