When the computer is accessing domain name, it’s no need to ask for help from DNS server every time. In general, when the analysis work is finished, the analysis entry will be saved in the flush DNS cache list in the computer. If at this time the DNS analysis appears to be changed, because the flush DNS cache list information has not been changed, so the computer still can’t get the latest analysis information from DNS server when it’s accessing the domain name, it will analyze according to the flush DNS cache relationship which is reserved in the computer, then the flush DNS analysis fault will come up. At this time, we should resolve the failure by commanding the flush DNS. First step: through “start-> run-> enter CMD” to enter the command line mode. The second step: we can see a parameter named ipconfig/flushdns in the command line mode, this is the command for clearing the flush DNS cache information. The third step: execute the ipconfig/flushdns command, when you get the information of “successfully flushed the DNS resolver cache”, this means the flush DNS cache information in the current computer has been successfully cleared. The fourth step: when we are accessing domain, we can get the latest analysis address on DNS server, the previous failure which was caused by flush DNS cache won’t happen again. Windows will cache the flush DNS entries that we have accessed for our next use, we can add the registry project to control the term of validity of cache. HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings the validity of old control Cache Value Name:DnsCacheTimeout Data Type:REG_DWORD Radix:Decimal Value: (time in seconds) Value Name:ServerInfoTimeOut Data Type:REG_DWORD Radix:Decimal Value: (time in seconds) But sometimes we can’t randomly change the relevant setting in the computer, and we just need to flush DNS cache in a particular case. A component in Windows called ipconfig.exe provides us a command line “ipconfig/flushdns”, in fact, in many cases we have to use this command, so remember it! Run the command of “ipconfig/displaydns” to check the flush DNS information which is cached in the computer, then type the command of “ipconfig /flushdns”, at this time the computer has emptied the flush DNS cache information, we can enter the first command to double check it.