Step 1: ping localhost, if the machine TCP / IP protocol is installed is normal, otherwise it will reinstall the TCP / IP protocol;
How to delete and reinstall the TCP / iPhttp: //support.microsoft.com/kb/285034
How to use Tracert to solve TCP / IP issues in Windows http://support.microsoft.com/kb/314868
Step 2: Ping Gateway, if returned to normal, there is no problem network physical connection, otherwise check the physical device connectivity of the network, network cable, switches, and the filtering rules and strategies of the network firewall;
Step 3: ping www.9cbs.net or use the nslookup command to check the DNS resolution, if the IP (Make sure IP is correct), indicating that DNS resolution is no problem, if the DNS parsing is not normal, and the direct PING IP is no problem, it can be judged as DNS parsing problem, check% systemroot% / system32 / drivers / etc / host file, first check the hosts file when resolving IP, Windows default If there is a resolution of the corresponding domain name in Hosts, see if Hosts exists. Address resolution (such as some viruses) change the Symantec online virus library upgrade website address to 127.0.0.1, resulting in a Norton upgrade virus library failed), otherwise check the router configuration.
How to use nslookup for DNS parsing test and diagnostics http://support.microsoft.com/kb/200525
The wiring standard in EIA / TIA specifies the line sequence of the wiring, 586A and 568B: Standard 568A line sequence is: green white, green, orange, blue, blue white, orange, brown white, brown standard 568B line order: Orange white, orange, green white, blue, blue, green, brown, brown
If the two heads are 568b, this line is a straight-through; if a head is 568A, a cross line (Crossover); a simple principle is that the use of straight lines, such as switches to NIC The same equipment uses a cross wire, such as two machines;
9CBS Collection Network Troubleshooting Article: http://community.9cbs.net/expert/topicview.asp? Id = 3859854
As for a detailed description, refer to the following article:
How to diagnose basic TCP / IP issues http://support.microsoft.com/kb/169790
HOW TO: Diagnostics and Test TCP / IP or NetBIOS Network connection http://support.microsoft.com/kb/300986
Windows Server 2003 TCP / IP Troubleshooting Document http://www.microsoft.com/china/technet/Prodtechnol/WindowsServer2003/operations/system/tcpiptrb.mspx
EIA / TIA 568A & 568B StandardHttp://www.utm.edu/staff/leeb/568/568.htm
