How to Fix the \'cannot unmarshal DNS message\' Error When Connecting to MongoDB Cloud from Go on Ubuntu?

Troubleshooting MongoDB Cloud Connection in Go on Ubuntu: Error "cannot unmarshal DNS message"

This error, "cannot unmarshal DNS message," occurs when an outdated version of Go is attempting to parse a compressed domain name in an SRV record. This is not directly related to the MongoDB Go driver.

Cause:

Go version 1.11 introduced stricter compliance with RFC-2782, which enforces specific formatting for SRV records. Some DNS servers may compress domain names in their SRV records, which Go 1.11 will reject.

Workarounds:

1. Use Non-SRV URI: Configure your MongoDB URI without the srv scheme to avoid using SRV records.
2. Update /etc/resolv.conf: Replace the nameserver addresses with compliant servers such as 1.1.1.1 or 8.8.8.8.
3. Upgrade Go: If possible, upgrade to Go 1.12 or higher, where the issue is resolved.

Additional Notes:

• This error primarily manifests on Linux systems in cloud environments.
• If you previously encountered this issue and it resolved on its own, it is possible that the DNS server was updated or a patch was applied to Go.

If you implement either workaround, your application should be able to connect successfully to your MongoDB Cloud database.

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