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This error message typically indicates that the Nginx server is unable to resolve the hostname "airbyte-api-server". This could be due to a variety of reasons such as incorrect configuration, network issues, or the service not being up and running. In the context of Docker and Docker Compose, this error could occur if the service "airbyte-api-server" is not correctly defined in your Docker Compose file, or if it's not up and running when Nginx tries to connect to it. Here are a few things you can try: 1. Check your Docker Compose file to ensure that the service "airbyte-api-server" is correctly defined and that it's using the correct image and version. 2. Ensure that the service "airbyte-api-server" is up and running. You can check this by running

docker ps

and looking for the service in the list of running containers. 3. If you're using a custom Nginx configuration, ensure that the upstream is correctly defined and that it's pointing to the correct service and port. 4. If you're running multiple Airbyte instances on the same server, ensure that the container names are unique for each instance. There's a known issue where changing container names can cause some internal code of the application to stop working and result in similar errors [[source](https://github.com/airbytehq/airbyte/discussions/32809)]. If you're still facing issues, it would be helpful to have more information about your setup, such as your Docker Compose file and any custom configurations you're using. Please note that these are general suggestions based on the information available in the knowledge sources and may not directly solve your issue. For more specific help, consider reaching out to the Airbyte community or support.