Breakdown of network disconnection caused by hardware and software failure

11 long holiday, I would like to take advantage of this Hard-won golden holiday, a good play on the internet, the author, never thought that the home network has been a baffling fault. For example, want to play the game site can not open, want to chat QQ always prompt login unsuccessful and other abnormal problems. So the author in order to troubleshoot, can be said to be laborious Dickens, after some inspection, finally find out the cause of the net, the specific inspection process please listen to the author slowly to you.

First,  to the hardware failure of careful inspection

If the network is not in place, only consider the hardware failure, you will first think of the network card, and the hub itself caused by the problem of the network. But for both of the examination, but few people can talk about the point, or in other words really know how to troubleshoot the few people, for this author based on his years of experience in the investigation of its related hardware for detailed investigation and explanation.

First check from the outside of the NIC, for example, its computer I/O slot on the NIC led is normal, the general network card will have two lights, one for the connection led, the normal display of the situation is always flashing, the other is the signal transmission led, as the name implies only in the transmission of data will not stop flashing. You can according to the above information prompts, look at their own two indicators are normal, such as the author's connection LED is not bright, it is possible that the network card itself installed problems, or network cable, hub of its own fault caused by the exception.

In order to find out the source of the fault, we first check the twisted pair of head, there is no top to the top of the RJ45 connector, and twisted pair of joints have no traces of damage and so on. If none of the above is a problem, we use the replacement method, to identify the network cable, the fault of the hub, such as a normal hub to replace their own do not know the problem of the hub, LED display as normal, then it is obviously the problem of the hub, and vice versa after the problem is still the problem of network cable.

Second,  software failure caused network impassability

Of course, also do not rule out some people network card signal led out of the problem, but this fault is mostly caused by network software. Common network card Driver most of the card with the set up the parameters of the program, we can use its test function, the network adapter sets the type of connector, IRQ, I/O port parameters to perform. If a conflict is found, reset the parameters correctly, then open the Control Panel dialog box, click the system → hardware → Device manager option, and then in the Device Manager dialog box that pops up (Figure 1). Expand the Network Adapters option, right click on the inside of the NIC select the "Properties" option, you can immediately view the operation of the network card.

Another network protocol is improperly configured, it will also cause network impassability, so here in the Control Panel dialog box, click the "network" → "Configuration" option, you can see the installed network protocol, to see if there is no TCP/IP protocol and Microsoft network client presence, Usually, so we focus on checking the TCP/IP protocol settings, in the Local Area Connection Properties dialog box, select the Internet Protocol (TCP/IP) option, click the Properties button, and in the Internet Protocol (TCP/IP) dialog box that pops up, The IP address is entered in the IP gateway and the address in the DNS server is consistent with the address of the telecommunications or Netcom server you are using (Figure 2). Then make sure that the settings take effect, and ping to check to see if the NIC is working properly.

If the network is running all right, the website you want to browse is still unable to open, at this time you have to further check IE browser. Right-click the IE browser icon, select the Properties option, and in the Internet Properties dialog box that pops up, go to the Privacy tab and see if the Slider tab in the Edit area is in, and if not, drag it to medium (Figure 3). And then cut to the "safe" tab above, in the Security settings box for a different zone, select the Trusted Sites option and click the Site button below to enter the site URL that you cannot access, and then click the "Add" button to make sure you have access to the site you want to browse.

In addition to the above, do not ignore the problem of network hijacking and malware, it is recommended to use Windows Cleanup Assistant to address the network vulnerabilities caused by its malicious programs.