Webhook Delivery Errors — Troubleshooting Failed HTTP Callbacks

Overview

Fix webhook delivery failures including timeout errors, SSL issues, and retry handling for reliable event-driven HTTP callback integrations.

Key Details

• Webhooks are HTTP POST callbacks triggered by events in a source system
• Delivery failures occur when the receiving endpoint is unreachable, slow, or returns non-2xx status
• Most webhook providers implement exponential backoff retry strategies
• Failed webhooks can cause data synchronization gaps between systems
• Payload signature verification failures are a common cause of rejected webhooks

Common Causes

• Receiving endpoint returning 5xx errors or timing out beyond the provider's limit (typically 5-30 seconds)
• SSL certificate errors on the receiving endpoint preventing HTTPS connections
• Firewall or WAF blocking incoming webhook POST requests from provider IP ranges
• Payload signature verification mismatch due to incorrect webhook secret configuration

Steps

1. 1Check your endpoint logs for incoming requests — if none appear, the issue is network-level (firewall/DNS)
2. 2Verify SSL certificate validity on your endpoint using 'openssl s_client -connect yourdomain.com:443'
3. 3Ensure your endpoint responds within the provider's timeout limit — offload processing to a background queue
4. 4Whitelist the webhook provider's IP ranges in your firewall and WAF rules
5. 5Verify the webhook secret matches between provider settings and your verification code

Tags

More in 5xx Server Error

Frequently Asked Questions