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To coincide with the release of MongoDB 3.6, all drivers (at the time) implemented the initial DNS seedlist discovery specification to ensure connections could be established using the new SRV connection string format, as well as the legacy standard connection string format.
Building with Go 1.11+ and using connection strings with the mongodb+srv scheme is unfortunately incompatible with some DNS servers in the wild due to the change introduced in https://github.com/golang/go/issues/10622. You may receive an error with the message "cannot unmarshal DNS message" while running an operation when using DNS servers that non-compliantly compress SRV records. Old versions of kube-dns and the native DNS resolver (systemd-resolver) on Ubuntu 18.04 are known to be non-compliant in this manner. We suggest using a different DNS server (8.8.8.8 is the common default), and, if that's not possible, avoiding the mongodb+srv scheme.
If your application uses MongoDB's Node.js driver or Mongoose ODM, occasionally you may observe errors such as querySrv ECONNREFUSED _mongodb._tcp.cluster0.abcde.mongodb.net or Error: querySrv ETIMEOUT _mongodb._tcp.cluster0.abcde.mongodb.net being thrown. The MongoDB Atlas documentation outlines several methods to troubleshoot connection issues, including how to handle "Connection Refused using SRV Connection String" scenarios, but why does this happen in the first place?