Why Does My gRPC Client Get 'Connection Closed Before Server Preface Received' When Connecting to a Dockerized Dgraph Server?

gRPC Error: Resolving "Connection Closed Before Server Preface Received"

In this issue, the developer encounters an intermittent gRPC error when attempting to make a query to a Dgraph server deployed in Docker. The error, "connection closed before server preface received," hints at a problem with the connection setup.

The root cause of the error often lies in a mismatch between the server's TLS configuration and the client's connection settings. In this case, if the server is configured with TLS enabled but the client tries to connect without TLS, the connection will fail with this error.

To resolve the issue, follow these steps to configure TLS options on the client:

Ensure that you are using client certificates on the client connection. Once these configurations are in place, the client should be able to establish a secure connection to the server and perform queries without encountering the "connection closed" error.

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