macOS DNS Troubleshooting

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Troubleshooting
macOS DNS

Why you need to change your DNS settings:

Your router is currently blocking the BCS from working properly. This is a security feature that some routers have turned on by default.

Think of it like your router acting as an overly protective security guard - it's trying to keep you safe, but it's also blocking our legitimate testing tool from doing its job.

By changing your DNS settings to use Google's servers instead of your router's, you're basically asking a different "phone book" to look up the IP address the BCS needs. Google's phone book will let our testing tool work correctly.

The simple fix: Change your computer's DNS settings to use Google's servers (8.8.8.8) instead of your router's automatic settings.

How to Change Your DNS Settings on macOS

Step 1: Open Network Settings

  • Click the Apple menu (🍎) in the top-left corner
  • Select System Settings (or System Preferences on older macOS versions)
  • Click on Network

Step 2: Select Your Active Network Connection

Choose the network connection you're currently using:

  • Wi-Fi (if using wireless)
  • Ethernet (if using a cable)

The active connection will show as "Connected" with a green dot.

Step 3: Access Advanced Settings

  • Click the Details button next to your active connection
  • Click on the DNS tab

Step 4: Add Google DNS Servers

  • Click the + button under "DNS Servers"
  • Add the following Google DNS servers one at a time:
    • 8.8.8.8
    • 8.8.4.4
    • 2001:4860:4860::8888 (IPv6)
    • 2001:4860:4860::8844 (IPv6)
  • Remove any existing DNS servers by selecting them and clicking the - button
  • Click OK

Step 5: Apply the Changes

  • Click Apply to save your changes
  • Close the Network settings window

Step 6: Clear Your DNS Cache

  • Press Command + Space to open Spotlight search
  • Type Terminal and press Enter
  • In the Terminal window, type: sudo dscacheutil -flushcache
  • Press Enter and enter your password when prompted
  • Then type: sudo killall -HUP mDNSResponder
  • Press Enter

Step 7: Test the Change

  • In the same Terminal window, type: nslookup bcs.visualware.com
  • Press Enter
  • You should now see Google's DNS servers (like 8.8.8.8 ) listed instead of your router's address

You're Done!

Close all windows and try the testing tool again. Your computer will now use Google's DNS servers instead of your router's, which should allow the BCS to work properly.

If you're still having problems please contact us and provide screenshots for the steps taken above.

For help taking screenshots on Windows - using the snipping tool - click here.