Error
51123: Twilsock: Upstream not resolved
Twilsock could not resolve the upstream target specified in the request. This error usually indicates that the upstream identifier is missing, malformed, or references a destination that is not available for the current Twilio client connection.
- The request includes an invalid upstream identifier.
- The upstream value is missing or formatted incorrectly.
- The client is attempting to connect to an upstream target that does not exist.
- The upstream target is not available for the current service configuration or environment.
- The SDK or application is passing the wrong parameter value when opening or routing the connection.
- Verify that your application sends a valid upstream value in the request.
- Check your client configuration and confirm that all required connection parameters are present and correctly formatted.
- Make sure the upstream target exists in the environment your application is using.
- Review recent application changes that affect Twilio client initialization, connection setup, or routing logic.
- Update to the latest supported Twilio SDK version if you are using an older client implementation.
- If the error persists, enable SDK logging in your application and review the request details sent during connection setup.