Why am I unable to access/connect to CORE?

If you are unable to access/connect to CORE, it may be that you are using a browser that is not supported.

The following browsers are preferred for CORE:

    • Microsoft Edge

    • Mozilla Firefox 10 ESR for Windows (With popup blocker disabled)

If you have verified that you are using a supported browser, you may need to clear your browser history (clear your cache).

To clear your browser History, follow the directions below.

Microsoft Edge:

  • Use the magnifying glass in your taskbar to search for "Internet Options".

  • Select Internet Options.

  • In the General tab click the Delete... button.

  • Uncheck Preserve Favorites website data.

  • Check Temporary Internet files and website files, Cookies and website data, and History.

  • Click the Delete button.

  • Click the Apply and OK buttons.

  • Close all windows/tabs and restart your browser.


  • Select the Application Menu button (three horizontal lines) in the upper right corner of the browser.

  • Select Settings from the drop-down menu.

  • In the left navigation panel select Privacy & Security.

  • Scroll down until you reach the History section.

  • From the drop-down menu for Time range to clear select Everything.

  • Check the Browsing & Download History, Active Logins, and Cookies & Cache.

  • Click the OK button.

  • Close all windows/tabs and restart your browser.

After you have cleared your browser history, you will want to close out your browser and bring it back up to see if your problem has been resolved. If clearing your cache does not resolve the problem, please email core.help@state.co.us and provide a screenshot of any error messages you are receiving.

You can also try to switch to a different preferred browser to see if this resolves your issues as well.