Free monitoring doesn’t work on ipv6 only environment.
rs0 [direct: primary] test> db.enableFreeMonitoring() Unable to get immediate response from the Cloud Monitoring service. Please check your firewall settings to ensure that mongod can communicate with 'https://cloud.mongodb.com/freemonitoring/mongo' rs0 [direct: primary] test> (To exit, press Ctrl+C again or Ctrl+D or type .exit) rs0 [direct: primary] test> root@engine-v6-only:~/hivesmartcontracts# host cloud.mongodb.com cloud.mongodb.com is an alias for global.lb-f.td.aws.cloud.mongodb.com. global.lb-f.td.aws.cloud.mongodb.com has address 22.214.171.124
It appears as if cloud.mongodb.com doesn’t have a v6 address.