n8n - 💡(How to fix) Fix Chat Trigger public chat URL returns "Connection rejected" after upgrade from 2.16.x to 2.17.4 [5 comments, 4 participants]

Describe the problem/error/question

After upgrading from n8n 2.14.2 (and I think also 2.16.1) to n8n 2.17.4, a workflow that was previously working stopped working. The workflow uses: • Chat Trigger • Chat node with sendAndWait with approval buttons (the one that gives the message and stays there)• • a timeout path The important point is that the issue is not related to a custom frontend. I can reproduce it directly using the public Chat URL generated by the Chat Trigger (not in the chat of the n8n editor as the buttons will not be shown as this is still a pending bug to fix: https://github.com/n8n-io/n8n/issues/27187: https://xxxxxxxx/webhook/3e79xxxxxxxxx/chat When I open that public Chat URL and try to use the chat, the execution starts but the chat ends up returning: Connection rejected This same workflow worked correctly on 2.14.2 (and I think also 2.16.1) before the upgrade to 2.17.4.

Steps to reproduce

1. Use the workflow (image below) or any workflow with a Chat Trigger and a Chat node with sendAndWait
2. Open the public Chat URL from the Chat Trigger: https://xxxxxxxx/webhook/3e79xxxxxxxxx/chat
3. Start the chat.
4. The workflow starts, but instead of continuing normally, the chat returns: Connection rejected

Expected behavior The public Chat URL should work normally and the workflow should continue through the expected chat interaction: • ask the user "Do you prefer boat or plane travel?" • allow choosing Plane or Boat with buttons (if you dont use the URL but the n8n chat the buttons will not be displayed (this is still a bug already reported: https://github.com/n8n-io/n8n/issues/27187), so you need to use the URL instead.) • or continue to the Timeout branch if no answer is received Actual behavior: The public Chat URL itself fails and returns: Connection rejected

What is the error message (if any)? Connection rejected

Please share your workflow/screenshots/recording

<img width="597" height="375" alt="Image" src="https://github.com/user-attachments/assets/146f5319-76a7-41a6-aabf-28c8f24457c4" /> <img width="1209" height="853" alt="Image" src="https://github.com/user-attachments/assets/ef10d422-51c1-48a9-95c8-02299fb505c0" /> <img width="702" height="589" alt="Image" src="https://github.com/user-attachments/assets/c36e4464-e244-4083-91cf-bf1adf169d39" />

Share the output returned by the last node I cannot provide a reliable successful output from the final node because the issue happens during the chat interaction itself. From the user side, the observable result is: Connection rejected So instead of receiving the expected chat continuation from the workflow, the public Chat URL fails with that error.

Debug info core • n8nVersion: 2.17.4 • platform: docker (self-hosted) • nodeJsVersion: 24.14.1 • nodeEnv: production • database: postgres • executionMode: regular • concurrency: -1 • license: enterprise (production) storage • success: all • error: all • progress: false • manual: true • binaryMode: filesystem pruning • enabled: true • maxAge: 336 hours • maxCount: 10000 executions client • userAgent: mozilla/5.0 (windows nt 10.0; win64; x64) applewebkit/537.36 (khtml, like gecko) chrome/147.0.0.0 safari/537.36 • isTouchDevice: false Generated at: 2026-04-22T10:40:54.579Z