Steps I've Already Taken: Confirmed Ngrok is actively running and forwarding traffic on port 3000. Verified my Next.js development server is running on localhost:3000. Ensured the HTTPS Ngrok URL in Vapi's tool configuration is updated and exactly matches the current Ngrok forwarding URL (restarting Ngrok gives a new URL, and I update Vapi immediately). Checked my Next.js terminal for any errors when Vapi attempts a connection (nothing shows up, indicating the request isn't even reaching my app). The Vapi tool configuration JSON itself seems correct: JSON { "id": "...", "type": "function", "function": { "name": "getholdings", "description": "can you get my current holding", "parameters": { "type": "object", "properties": {}, "required": [] } }, "server": { "url": "https://5599-2401-4900-55b3-6a09-c153-c8a3-4429-621e.ngrok-free.app/api/kite-holdings", // (Placeholder URL) "headers": {} }, "async": true } It's baffling that Postman can connect but Vapi can't. Has anyone encountered this specific scenario before where a webhook works externally but not from Vapi's internal testing? Could it be a subtle Ngrok free-tier limitation, Vapi's specific server IPs, or something I'm overlooking? Any ideas or debugging tips would be hugely appreciated! Thanks in advance! 🙏