Clearing your DNS cache

Overview

Your DNS cache stores the locations (IP addresses) of webservers that contain pages which you have recently viewed. If the location of the web server changes before the entry in your DNS cache updates, you will be unable to access the site.

If you encounter a large number of?HTML 404 error codes, you may need to clear your DNS cache. Once you clear your DNS cache, your computer will query nameservers for the new DNS information.

How to clear your DNS cache

The following methods allow you to remove old and inaccurate DNS information that may result in 404 errors.

Windows? 8

  1. Press?Win+X?to open the?WinX Menu.
  2. Right-click on?Command Prompt?and select?Run as Administrator.
  3. Enter the following command:

    ipconfig /flushdns
    If the command was successful, you will see the following message:
    Windows IP configuration successfully flushed the DNS Resolver Cache.

Windows 7

  1. Click the?Start?button.
  2. Enter?cmd?in the?Start?menu search text box.
  3. Right-click on?Command Prompt?and select?Run as Administrator.
  4. Type the following command and press?Enter:?ipconfig /flushdns
  5. If the command was successful, you will see the following message:

    Windows IP configuration successfully flushed the DNS Resolver Cache.

Windows XP, 2000, or Vista?

  1. Click the?Start?button.
  2. On the?Start?menu, click?Run....
    • If you do not see the?Run?command in Vista, enter?run?in the?Search?bar.
  3. Type the following command in the?Run?text box:

    ipconfig /flushdns

MacOS? 10.7 and 10.8

  1. Click?Applications.
  2. Click?Utilities.
  3. Double-click the?Terminal?application.
  4. Type the following command:

    sudo killall -HUP mDNSResponder

    Warning:

    Icon

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

MacOS 10.5 and 10.6

  1. Click?Applications.
  2. Click?Utilities.
  3. Double-click the?Terminal?application.
  4. Type the following command:

    ?

    sudo dscacheutil -flushcache



?

We expect that you have basic computer skills and a basic understanding of how the use the software installed on your computer. We cannot offer free training to users who need extra help learning to use email and other programs. ?

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