Why is my GoLang MongoDB connection failing with a SASL authentication error, and how can I fix it using `authenticationDatabase`?

Troubleshooting MongoDB SASL Authentication Error

In GoLang, establishing a MongoDB connection often requires authentication. Sometimes, developers encounter the error "server returned error on SASL authentication step: Authentication failed," despite providing correct credentials. To resolve this issue, it is crucial to consider the authenticationDatabase parameter.

The issue arises when connecting to a remote MongoDB instance that requires authenticationDatabase to be explicitly set. This parameter specifies the database that authenticates the user. By default, it is set to the database the user is trying to access. However, if the user has different privileges for different databases, it becomes necessary to specify the authenticationDatabase.

To use the authenticationDatabase parameter in GoLang, simply modify the DialInfo struct:

mongoDialInfo := &mgo.DialInfo{
    Addrs: []string{dbHost},
    Database: dbName,
    Username: userName,
    Password: password,
    Timeout: 60 * time.Second,
    // Add the authenticationDatabase parameter
    AuthenticationDatabase: dbName,
}

By setting the AuthenticationDatabase to the same value as the Database, you are explicitly specifying the database to use for authentication. This ensures that the user's credentials are validated correctly and authentication succeeds.

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