I would like to request Zeabur's assistance in troubleshooting a TLS/certificate chain compatibility issue between the generated domain and the LINE Messaging API webhook verification.
Service Information:
- Project ID: 69c39858e11ead6d2defb0f2
- Service ID: 69cbcd70cb1dac3576fbfdf5
- Generated domain: [my-domain].zeabur.app
LINE webhook URL is currently set to: https://[my-domain].zeabur.app/line/webhook
Current Status:
- The application layer is functioning normally:
- HEAD /line/webhook = 204
- GET /line/webhook = 200
- POST without signature = 400
- However, the LINE Developers Console consistently returns: “An SSL connection error occurred.” when verifying the webhook URL.
Therefore, I suspect:
- The issue is likely not an incorrect webhook path.
- The issue is likely not an unresponsive application.
- It is more likely occurring at the TLS/certificate chain stage before the LINE request reaches the app.
I would like to ask Zeabur to help confirm:
- What is the full TLS certificate chain actually sent by
friday-navora.zeabur.app?
- leaf
- intermediate
- root
- issuer
- Is the intermediate CA sent completely?
- Does the current generated domain use a certificate chain like ZeroSSL/Sectigo?
- If so, what is the full trust path?
- Is it possible that the Zeabur generated domain's certificate chain has compatibility issues with the LINE webhook verifier? For example:
- Incomplete chain delivery
- Trust compatibility issues
- Edge/ingress TLS handshake issues
- If I do not use a custom domain, are there any feasible adjustments for the generated domain? For example:
- Re-provision certificate chain
- Alternative chain
- Cross-signed chain
- Other actions that can be taken on the Zeabur platform side
Additional notes:
- I have already tried recreating the generated domain, but the issue persists.
- This requirement is to ensure the LINE bot webhook can be successfully verified, not just that the URL opens normally in a browser.
I would like to confirm if this is a compatibility issue at the TLS/certificate chain level for Zeabur generated domains, and if there are any recommended solutions from the platform.