'php mongodb no suitable servers found ( serverselectiontryonce set)

This is connection string mongodb://$connection/?tls=true&tlsCAFile=rds-combined-ca-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false&w=majority

It is working via API call. but import into php packages i'm getting below error.. No suitable servers found (serverSelectionTryOnce set): [connection error calling hello on 'hostname:27017']



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