I noticed that I had my ad blocker on. When I turned it off, it worked.

Answer from Виталий Жуков on Stack Overflow
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Google Support
support.google.com › tagassistant › answer › 10039345
Troubleshoot with Tag Assistant - Tag Assistant Help
The URL you entered might not have the Google tag on the page. Try a different URL on your website where you expect to have the Google tag installed. The debug parameter added to the page URL may interfere with page behavior. To solve this, edit the domain that you enter for debug mode, and ...
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Reddit
reddit.com › r/googletagmanager › gtm issue : could not connect to tag assistant
r/GoogleTagManager on Reddit: GTM issue : Could not connect to Tag Assistant
February 7, 2023 -

Hi everyone!

Hope that someone can help me with this.

I noticed this morning that when I use the Preview mode in GTM, the Tag Assistant windows says "Could not connect to Tag Assistant" :

https://www.dropbox.com/s/vcu8seilad6t196/2023-02-07_15h50_33.jpg?dl=0

The issue is not specific to that particular account, but all GTM accounts seems to be touched. I confirm that the GTM tag is properly installed on those websites. The preview mode have been working for years on those websites without any issue.

Thank you in advance for your help!

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Google Support
support.google.com › tagmanager › thread › 77516582 › tag-assistant-could-not-connect-to-a-tag
Tag Assistant could not connect to a tag - Tag Manager Community
Skip to main content · Tag Manager Help · Sign in · Google Help · Help Center · Get started with Tag Manager · Get started with the Google tag · Manage user consent with consent mode · Manage accounts and containers · Concepts and components
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Devmanextension
devmanextensions.com › home › fix “could not connect to tag assistant” error in google tag manager (preview mode)
Fix “Could Not Connect to Tag Assistant” error in Google Tag Manager (Preview Mode) - DevmanExtensions Blog
May 8, 2025 - 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.
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Analytics Mania
analyticsmania.com › post › google-tag-manager-preview-mode-not-working
[Solved] Google Tag Manager Preview Mode Not Working? 26 ways to fix it
October 30, 2025 - EVENTUALLY, I tried it in Chrome and it worked first time! Doh! ... O`key guys! I found 1 way, spend on it solve 2 hours! If you have Tag Assistant - do the connection to site, and when you see "Couldn't connect to....
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Technically Product
technicallyproduct.co.uk › technically product | digital marketing and web analytics › tag management › new google tag assistant not connecting? it could be brave browser's 'shields up' | technic ...
New Google Tag Assistant not connecting? It could be Brave browser's 'Shields Up' | Technically Product
August 15, 2023 - Having 'Shields Up' on a website (which is the default) will absolutely prevent Tag Assistant from connecting. Incidentally having Shields Up will also block any other Google endpoints, including Google Ads, Google Analytics and Optimize.
Find elsewhere
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WordPress
wordpress.org › support › topic › tag-manager-is-connected-but-tag-assistant-not
Tag manager is connected, but tag assistant not | WordPress.org
November 30, 2023 - @akrkmpr Thanks for sharing the information. Can you confirm that when going to Site Kit > Settings > Connected Services > Tag Manager that you see your connected container ID GTM-KKN•••••?
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Webflow
discourse.webflow.com › design help › general
Can't get Google Tag Assistant to Function - General - Forum | Webflow
September 27, 2020 - https://preview.webflow.com/pr... I am unable to get my Tag Assistant to work. It continues to say 0 Google Containers found, as well as Tag Assistant could not connect to a tag on …website… Retry A timeout occurred while attempting to connect....
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Stack Overflow
stackoverflow.com › questions › 67519868 › google-tags-does-not-show-up-in-google-tag-assistant-but-it-shows-in-gtm-and-ana
wordpress - Google tags does not show up in Google Tag Assistant but it shows in GTM and Analytics' debug - Stack Overflow
Connect and share knowledge within a single location that is structured and easy to search. Learn more about Teams ... I am new to all of this and am trying to install the GTM tag on my WordPress website. I tried the plugin Google Tag Manager for WP and later in Google Site Kit. In both methods, I can only see the tags through Tag Assistant when logged in WordPress.
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Reddit
reddit.com › r/analytics › google tag manager not connecting to website after update
r/analytics on Reddit: Google Tag Manager not connecting to website after update
August 31, 2020 -

Hello all,

I am running into an issue after the new update. For a couple of my sites, I get this error message:

"Could not connect to (REDACTED).net.

Tag Assistant could not connect to a tag on
REDACTED.net

A timeout occurred while attempting to connect.
Check that the page is tagged correctly and no errors have occurred."

Any idea why I may be running into this issue? It was working fine on Thursday. I am using Wix currently for my websites if that may help at all. A sidenote is that I am not getting any history changes like I was on Thursday so I don't know if more changed after the update. Any thoughts?

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Google Support
support.google.com › tagmanager › answer › 10039345
Troubleshoot with Tag Assistant - Tag Manager Help
The URL you entered might not have the Google tag on the page. Try a different URL on your website where you expect to have the Google tag installed. The debug parameter added to the page URL may interfere with page behavior. To solve this, edit the domain that you enter for debug mode, and ...
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Google Support
support.google.com › tagassistant › answer › 2954338
Are there instances in which Tag Assistant won’t pick up tags? - Tag Assistant Help
If you’re using the default version and have not enabled checks for 'Parse External Scripts' -- yes. If the Google tag is implemented incorrectly such that the pixel itself does not fire AND the tag is inside of a container tag, separate script, or iFrame, the Tag Assistant will not properly diagnose the implementation.
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Google Support
support.google.com › tagmanager › thread › 325907495 › tag-assistant-not-connecting-to-website
Tag assistant not connecting to website. - Tag Manager Community
Skip to main content · Tag Manager Help · Sign in · Google Help · Help Center · Get started with Tag Manager · Get started with the Google tag · Manage user consent with consent mode · Manage accounts and containers · Concepts and components
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Reddit
reddit.com › r/googletagmanager › losing connection to tag assistant
r/GoogleTagManager on Reddit: Losing connection to Tag Assistant
October 1, 2024 -

Has anyone had difficulty with losing connection with tag assistant using Chrome? It's happened to me for as long as I can remember, where I get a few minutes or seconds of having the page connected and then it just randomly disconnects. I've tried disabling all extensions, etc. to no avail.

Disabling the Tag Assistant extension does help, but then it makes it utterly unusable with a new window created, no way to change the URL, etc. So I have go to back to using the Tag Assistant and live with it dropping the connection persistently.

I could use Safari, but that's a pain too.

  • Any ideas what might be going on?

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Simo Ahava
simoahava.com › analytics › new-preview-mode-google-tag-manager
Tag Assistant Preview Mode In Google Tag Manager | Simo Ahava's blog
October 15, 2020 - So if you find Tag Assistant not working or the preview badge in the debug window not finding a connection, you’ll need to go back to Tag Assistant and connect a new debug window.
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HubSpot
community.hubspot.com › t5 › APIs-Integrations › Google-Tag-Manager-looses-connection-after-HubSpot-Form › m-p › 791657
HubSpot Community - Google Tag Manager looses connection after HubSpot Form - HubSpot Community
April 10, 2025 - There is an option to add a HS Listener Tag (which is a custom HTML tag) but because its a custom html tag, you can not connect it to G-Ads via GTM....
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Google Support
support.google.com › tagmanager › thread › 128020152 › tagassistant-not-connected
Tagassistant not connected - Tag Manager Community
Skip to main content · Tag Manager Help · Sign in · Google Help · Help Center · Get started with Tag Manager · Get started with the Google tag · Manage user consent with consent mode · Manage accounts and containers · Concepts and components
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Reddit
reddit.com › r/googleanalytics › tag assistant not finding tags
r/GoogleAnalytics on Reddit: Tag Assistant not finding tags
September 26, 2023 -

I don't use analytics very often but I've been trying to figure something out and I wanted to make sure everything was working properly but when I check in with Tag Assistant it connects to the site but says there are 0 tags found. I've confirmed that the snippets are installed properly on the site and in Tag Manager the Tag Coverage says the pages are tagged. How do I get the Tag Assistant to recognize the tags?