ubuntu-flush-dnsHello guys,

Maybe you have notice that sometimes your network has trouble at reaching some or many websites.
An example of these is the common “404” error . This may be due to a corrupt local DNS cache.
I will show you some ways to clear your local DNS cache on some Operating Systems.

  • On GNU-linux / unix distros, we have to mention that there are many ways of DNS flushing, it depends on the OS. Flush nscd DNS cache:  nscd is able to speed up consecutive access to the same data dramatically and increase overall system performance. So lets restart nscd.

$ sudo /etc/init.d/nscd restart
OR
# service nscd restart
OR
# service nscd reload
OR
nscd -i hosts (Clear local DNS cache for current user)
nscd -I hosts (Clear local DNS cache for all users)

  • Mac OS X
    10.5.2 and above 
    (application -> utilities -> terminal)

sudo killall -HUP mDNSResponder

(To run this command, you will need to know the computer’s Admin account password.)

10.5.1 and below

sudo dscacheutil -flushcache

  • Windows 8(Press Win+X to open the WinX Menu then Right-click on Command Prompt and select Run as Administrator)

ipconfig /flushdns

  • Windows Vista / Windows 7(Right-click on Command Prompt and choose Run as Administrator)

ipconfig /flushdns

  • Windows XP(command prompt line, CMD

ipconfig /flushdns

Have a nice day.

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