How to solve “Could not connect to YOUR_DOMAIN” error in Google Tag Manager

In the fast-paced realm of digital marketing, tools like Google Tag Manager (GTM) are indispensable for efficient tag management and accurate conversion tracking. We recently faced a baffling issue: GTM’s “Preview” mode stopped connecting without any clear reason. There had been no changes to our code, which led us to deduce that the cause was external.

Symptoms and Diagnosis

When trying to initiate the connection, we were met with a loading screen that lingered for about a minute, only to end with a frustrating error message:

After this time we obtain this error in Preview Mode in Google Tag Manager:

A timeout occurred while attempting to connect to YOUR_DOMAIN

There are currently no debuggable Google tags at that address. Please verify that:

  • There is a Google tag on the page.
  • The Google tag is not a legacy tag. Learn more
  • The Google tag is not being blocked, e.g. by a browser extension or a consent dialog.

Please check that the page is tagged correctly and try again. Learn more

We double-checked that Google tags were present and up-to-date on the page and that there were no active blockers. Despite this, the issue persisted.

Pinpointing the Culprit

After thorough investigation, we pinpointed the culprit: the “Tiktok Pixel Helper” Chrome extension. This extension was blocking the connection for GTM’s “Preview” mode, which led us to a simple yet effective solution.

Steps to Fix the GTM Connection Issue:

  1. Open your Google Chrome browser and go to the extensions section.
  2. Find and uninstall the “Tiktok Pixel Helper” extension.
  3. Close the “Preview” window and any other Google Tag Manager-related windows.
  4. Restart Google Tag Manager and the “Preview” mode.

Conclusion and Hopes for Improvement

By following these steps, GTM’s “Preview” mode should start working correctly again, allowing for proper tag visualization and debugging. Although this issue was a setback, we trust that the Tiktok team will address it soon to prevent future conflicts with vital marketing tools like Google Tag Manager.

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