Secure Access Help Center

Clear Your DNS Cache

After you configure your DNS to direct traffic from your network to the Cisco Secure Access global DNS resolvers, you may need to clear the DNS cache on your computers, servers, and browsers in your organization.

Table of Contents

Prerequisites

  • Administrative privileges on the device or server where the DNS is configured and user devices in the organization running browsers.

Clear Your DNS Cache on Computers and Servers

Choose the operating system version of the devices in your organization and follow the steps to clear the DNS cache on the devices.

Windows 7 and Earlier

  1. Click the Start Menu.
  2. Navigate to All Programs.
  3. Choose Accessories and right-click Command Prompt.
  4. Choose Run as Administrator.
  5. Run the following command in the command line and press enter.
 ipconfig /flushdns

Windows 8 and Newer

  1. Press the Windows Key or hover over the bottom left corner, and then click the Windows icon.
  2. Begin typing Command Prompt.
  3. Right-click the application and select Run as Administrator.
  4. Run the following command in the command line and press enter.
ipconfig /flushdns

OS X 10.4 TIGER

  1. Click the Terminal icon in the dock or in Finder under Application/Utilities/Terminal.
  2. Run the following command in the command line and hit enter.
lookupd -flushcache

OS X 10.5 and 10.6 LEOPARD

  1. Click the Terminal icon in the dock or in Finder under Application/Utilities/Terminal.
  2. Run the following command in the command line and press enter.
dscacheutil -flushcache

OS X 10.7 and 10.8 Lion

  1. Click the Terminal icon in the dock or in Finder under Application/Utilities/Terminal.
  2. Run the following command in the command line and press enter.
sudo killall -HUP mDNSResponder

OS X 10.9 and 10.10

  1. Click the Terminal icon in the dock or in Finder under Application/Utilities/Terminal.
  2. Run the following command in the command line and press enter.
dscacheutil -flushcache;sudo killall -HUP mDNSResponder

Linux

  1. Open a terminal window.
  2. Run the following command in the command line and press enter.
sudo /etc/init.d/nscd restart

Ubuntu Linux

  1. Open a terminal window.
  2. Run the following command on the command line and press enter.
sudo service network-manager restart

Clear Your DNS Cache on Browsers

Choose the browser and operating system version of the devices in your organization and follow the steps to clear the DNS cache on the browsers.

Internet Explorer 8 and Newer – Windows

  1. Navigate to the History menu.
  2. Select Delete Browsing History.
  3. Check all boxes except passwords and then click Delete.

Mozilla Firefox – Windows

  1. Click Firefox at the top left of your browser.
  2. Navigate to the History menu.
  3. Select Clear Recent History and check all boxes.
  4. Under Time range to clear, select all options except passwords, and then click Clear Now.

Apple Safari – macOS

  1. Expand the cog icon in the upper right corner.
  2. Select Reset Safari.
  3. Check all boxes and then click Reset.

Apple Safari – macOS

  1. Go to the Safari menu.
  2. Select Reset Safari.
  3. Check all boxes and then click Reset.

Google Chrome – Windows

  1. Expand the wrench icon in the upper right corner.
  2. Select History and check all boxes.
  3. Select Clear data for this time period, and then choose all options except passwords.
  4. Click Clear Data.

Google Chrome – macOS

  1. Navigate to the Chrome menu, and then select More Tools.
  2. Select Clear Browsing Data, and then choose all options except passwords.
  3. Click Clear Data.

Point Your DNS to Cisco Secure Access < Clear Your DNS Cache > Update a Network Resource

Updated 5 months ago