Why Does My GoLang MongoDB Connection Fail with 'Authentication Failed' and How Can I Fix It?

Unable to Authenticate with MongoDB via SASL

Problem

A GoLang MongoDB connection attempt fails with the enigmatic error message "server returned error on SASL authentication step: Authentication failed." Despite ensuring the correctness of credentials and other connection parameters, the issue persists.

Solution

In some cases, explicitly specifying the authentication database using the --authenticationDatabase parameter resolves the authentication failure. This parameter denotes the database against which the MongoDB user credentials should be validated. Incorporate it into your code as demonstrated below:

mongoDialInfo := &mgo.DialInfo{
    Addrs:               []string{dbHost},
    Database:            dbName,
    Username:            userName,
    Password:            password,
    Timeout:             60 * time.Second,
    AuthenticationDatabase: "admin", // Specify authentication database here
}

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