504 error setting up mongodb source from local

I'm sorry, but the provided knowledge sources do not contain information about a 504 error occurring while setting up a MongoDB source from local in Airbyte. However, a 504 error typically indicates a gateway timeout error, which means that a server did not receive a timely response from another server that it was accessing while attempting to load the web page or fulfill another request by the browser. This usually means that the other server is down or not working properly. If you're experiencing this issue, I would recommend checking the status and logs of your MongoDB server. Also, ensure that your MongoDB server is properly configured and accessible from where you're running Airbyte. For more detailed help, you might want to check the [Airbyte documentation](https://docs.airbyte.io/) or ask for help in the [Airbyte community](https://community.airbyte.io/).