No suitable servers found (`serverSelectionTryOnce` set): [Failed to resolve 'localhost:27017']

[halaei]

This config used to work in version 3.3 (laravel 5.5) it is not working now in 3.4 (laravel 5.6)

        'mongodb' => [
            'driver'   => 'mongodb',
            'dsn' => 'mongodb://localhost:27017',
            'database' => env('MONGODB_DATABASE'),
        ],

Error:

In Collection.php line 515:
                                                                                                   
  No suitable servers found (`serverSelectionTryOnce` set): [Failed to resolve 'localhost:27017'] 

[halaei]

#1397 is the braking pull request.
In Connection class $this->getDsn() returns the invalid dsn "mongodb://localhost%3A27017"

ping @StevePorter92