Unable to authenticate using sasl protocol mechanism SCRAM-SHA-1

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Wim Kuijpers

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Oct 15, 2017, 1:01:01 AM10/15/17

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I use the C# driver to connect to Atlas but I get this message: Unable to authenticate using sasl protocol mechanism SCRAM-SHA-1

How do I change the authentication settings?

Wan Bachtiar

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Oct 19, 2017, 11:59:36 PM10/19/17

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How do I change the authentication settings?

Hi Wim,

MongoDB Atlas clusters would have SCRAM-SHA-1 authentication mechanism by default.
Please make sure you’re using a compatible version MongoDB C# driver. please see C#/.Net Driver Compatibility chart for more information.

You could also check whether the application IP address is on your MongoDB Atlas cluster whitelist. See also Connect to Your Cluster
I would suggest to try connecting via mongo shell first from your application server to make sure you have access/connection. For connecting with MongoDB C# driver to MongoDB Atlas please see C#/.Net Driver Example.