Troubleshooting: Error Code

Seeing a "403 Forbidden" error, or a similar error code, when you or a student try to log in or use ReadTheory? This is almost always caused by something on the browser side (outdated version, an extension, or cached data), not a problem with the account itself. Try the steps below in order.

📑 Table of Contents

• Quick Fixes to Try First
• Still Seeing the Error?
• Related Articles & Resources

Quick Fixes to Try First

1. Use Google Chrome, and make sure it's up to date. Both you and your students should be on the latest version. To update Chrome:
• Open Chrome and click the three dots in the top-right corner.
• Click Help, then About Google Chrome.
• If an update is available, click Update, then Relaunch.
• (If you don't see an update option, you're already on the latest version.)
2. Turn off any ad blockers or pop-up blockers. These can interfere with the site.
3. Try logging in through an Incognito window. Use Ctrl+Shift+N on Windows/Chromebook, or Cmd+Shift+N on Mac.
4. Clear your cache and cookies. Use Ctrl+Shift+Delete on Windows, or Cmd+Shift+Delete on Mac.

Still Seeing the Error?

If the issue continues for a teacher or student after trying the steps above, email support@readtheory.org with:

• The username
• The email address
• The full name on the account

We'll dig in further from there.

Related Articles & Resources

Supported Devices & System Requirements

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