Cannot migrate default database to MSSQL in AWS RDS

Cannot migrate default database to MSSQL in AWS RDS

I am following the instructions listed for migrating the database, but I keep getting an error message: "Socket Time Out while trying to fetch database instances from host".  I have tested by using a security group that allows all traffic to the database instance, and it still fails with the same error.  Has anyone been successful in doing this so far?

Thanks
Gary