Failure phenomenon: A small Internet café lan, which no 20th computer in the "Network Neighborhood" to see other computers, other computers can not see 20th computer. But other computers can see each other in their "Network Neighborhood".Failure analysis and elimination: According to the fault analysis, this fault may be 20th computer network configuration problem or network card problems or network problems caused by. First Ping 127 0.0.1, you can ping, to explain the computer's network protocol and Nic Normal. Then check the network cable, found the network cable is normal. Then check the configuration of the network, found that the computer's IP address, gateway, and other settings are normal, check the user name and workgroup, found the workgroup name of a letter less. After you change the workgroup name, connect the test and troubleshoot.