LINE Webhook SSL connection error — Worked yesterday, broken today

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JJoshTsang916DEVELOPER3d ago

Issue:

Everything was working fine yesterday, but today LINE webhooks are suddenly not receiving any events.
When clicking 'Webhook Verify' in the LINE Developers Console, the error message is: "An SSL connection error occurred."
I have made no changes on my end (no redeployments, no configuration changes).

Troubleshooting steps taken:

The n8n workflow is Published (active).
The Zeabur Dashboard shows the service is Running normally.
There are no current incident reports on the official LINE Platform status page.
The error is clearly at the SSL layer, not a timeout or 404.

Question: Are there any known renewal issues or anomalies with *.zeabur.app subdomain SSL certificates recently? Is there a way to manually trigger a re-issuance of the SSL certificate from the Dashboard?

Thanks!

4 Replies

JJoshTsang916DEVELOPER3d ago

line Webhook errors display

could_not_connect

TLS handshake failure

BCBohan ChenEMPLOYEE3d ago

Hello! If you are suddenly encountering SSL connection errors with your LINE webhook without making any changes, it might be a temporary issue during the automatic SSL certificate renewal process.

Please try the following:

Redeploy your service in the Dashboard (this will trigger a re-issuance of the SSL certificate).
Wait a few minutes, then verify it again in the LINE Developers Console.

If the issue persists after redeploying, please provide your service domain, and we will check the certificate status from our backend.

JJoshTsang916DEVELOPER3d ago

Hello, thank you for your reply. I have already tried the following steps:

Restart the service — n8n starts normally, but the SSL error persists.
Remove the domain and re-bind it — still getting a TLS handshake failure.
Redeploy the service — no improvement.

This issue has been ongoing since this afternoon (4/1). The n8n service itself is running fine; I can trigger the workflow normally by sending a curl POST request to the same webhook URL from my local machine. However, when LINE's servers try to connect, the TLS handshake keeps failing.

The error logs on the LINE platform show 7 connection attempts from 19:46 to 22:24 (UTC+8), all resulting in TLS handshake failures.

My service domain is: josh916n8n.zeabur.app

Please help me check the certificate status from the backend. Thank you!

Ppan93412EMPLOYEE20h ago

Thanks for bringing this to our attention! We looked into it and found that our upstream SSL provider, ZeroSSL, has a new trust chain that LINE's server does not recognize. We have implemented a hotfix to address this issue. Please generate another zeabur.app domain or tell me which domain need for hotfixing (I have fixed the josh916n8n.zeabur.app one), and check if your LINE webhook is functioning properly now. Thank you!

If you have another domain with the same situation, please reply to this ticket (or open a new one), and we will gladly assist you in setting up the hotfix.

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