Overview

This article suggests how to fix the black and white 403 error code that appears when you try to log in to Sonar Tracker, when the size of your Internet browser cookies are too large:

If you see a bold 403 message that is different to the one above, see Sonar Tracker: How do I fix a bold 403 error when logging into Sonar Tracker?

Instructions

To fix this problem you need to clear your cookies in your browser. Follow the appropriate instructions for your browser from those listed below:

Google Chrome

To clear your cache and/or cookies in Google Chrome:

1. In the top right of the screen click on the vertical ellipsis (three vertical dots).
2. Select More Tools.
3. Select Clear browsing data.
4. Ensure the time range is set to All time.
5. Ensure the box next to Cached images and files and/or Cookies and other site data is checked. You may decide to clear browsing data as well.
6. Select Clear Data.

Microsoft Edge

To clear your cache and/or cookies in Microsoft Edge:

1. In the top right of the screen, select the horizontal ellipsis (three horizontal dots).
2. Select Settings.
3. Select Clear browsing data.
4. Select Choose what to clear.
5. Ensure the time range is set to All time.
6. Ensure the box next to Cached images and files and/or Cookies and other site data is checked. You may decide to clear browsing data as well.
7. Select Clear Data.

Outcome

After clearing your cookies and refreshing your page, you can log in to Sonar Tracker. 

If you are still unable to log into Sonar Tracker after following the appropriate help linked to above, raise a ticket. 

Related information

• Sonar Tracker: How do I fix a bold 403 error when logging into Sonar Tracker?
• Sonar Tracker: How do I get support?

Updated 22 January 2026 16:52