"No suitable servers found" connecting to MongoDB using PHP


I’m trying to connect from my PHP application to MongoDB instance located in FRA1, but I get this errorr: No suitable servers found (serverSelectionTryOnce set): [connection error calling hello on ‘[app]’]

I’m using PHP 8 with ext v.1.10, MongoDB Server is the 4.4. The strange thing I see is that the DNS of my connection string (grab from my DO Panel) is [app] but the one but the error talks about [app]

No problem if I try to connect to my instance using clients like MongoDBCompass or Robot3T.

What does that error means? Thaks in advance, CloudStore

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Hi there,

Could you share your PHP connection string that you are using? Make sure to remove any sensitive information before posting it here.

Also I would recommend trying to add +srv to your connection string as follows:

$db = new MongoDB\Client('mongodb+srv://[myapp]', array(
    'username' => 'doadmin',
    'password' => '[password]',
    'db'       => '[database]',
    'authSource' => 'admin',
    'replicaSet' => '[replica]',
    'tls' => 'true',
    'tlsCAFile' => '/usr/share/ca-certificates/app/ca-certificate.pem'

Best, Bobby