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I’m deploying n8n on Zeabur and trying to connect it to LINE Messaging API, but LINE webhook verification keeps failing with this error:

“An SSL connection error occurred.”

I believe this may be related to the SSL/TLS certificate or edge networking on the Zeabur domain side, because the application itself appears to be reachable.

My setup

• Service: n8n
• Region / Provider: Tencent Cloud Singapore
• Original domain: han8n-design-1-0.zeabur.app
• New domain tested: han8n-design-1-0b.zeabur.app
• Webhook URL currently used in LINE:
  https://han8n-design-1-0b.zeabur.app/webhook/line-webhook

What I have already checked

• n8n service is running normally
• Webhook path is configured as:
• Method: POST
• Path: line-webhook
• I am using the Production URL, not the test URL
• I updated these environment variables:
• N8N_HOST=han8n-design-1-0b.zeabur.app
• N8N_PROTOCOL=https
• N8N_PROXY_HOPS=1
• WEBHOOK_URL=https://han8n-design-1-0b.zeabur.app/
• I restarted the n8n service after updating variables
• I also generated a brand new zeabur.app domain and retried verification

Browser test

When I open this URL in the browser:
https://han8n-design-1-0b.zeabur.app/webhook/line-webhook

I get this response:

{"code":404,"message":"This webhook is not registered for GET requests. Did you mean to make a POST request?"}

So the route appears reachable from the browser, but LINE still reports an SSL connection error during webhook verification.

Request

Could you please help check whether there is any SSL certificate / TLS handshake / edge proxy issue on the Zeabur domain side for this service?

If needed, I can provide more screenshots or logs.

Thank you.