National Weather Service United States Department of Commerce

Dangerous Cold Plunging through in the Central U.S.; Heavy Snow from the Central Plains to the Southern Mid-Atlantic

An Arctic air mass will continue to plunge south through the central U.S. this week with widespread, record-breaking cold likely. Sub-freezing temperatures are likely to reach as far south as the Gulf Coast. Heavy snow will move from the Rockies this morning across the central Plains and Ozarks, Tennessee Valley, and North Carolina into the southern Mid-Atlantic states through Wednesday. Read More >

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How To Clear Your DNS Cache

 

  • How to clear your DNS cache

    • Windows® XP, 2000, or Vista®

    • MacOS® 10.7

    • MacOS® 10.5 and 10.6

Overview

Your DNS cache stores 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® 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 in the Run text box: ipconfig /flushdns

MacOS® 10.7

 

  1. Click Applications.

  2. Click Utilities.

  3. Double-click the Terminal application.

  4. Type the following: sudo killall -HUP mDNSResponder

    • Warning: 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: dscacheutil -flushcache