Create t2 instance and connect via Wokrbench
customer VPC does not support DNS resolution and/or hostnames.


A quick search for the error message uncovers what it means: your VPC (Amazon Virtual Private Cloud) is not configured to support DNS resolution and/or hostnames, both of which are required to make an RDS instance inside VPC publicly accessible.

The solution appears to be to configure the VPC with these capabilities enabled, after, of course, considering why they might have been disabled to begin with.

http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/vpc-dns.html

https://forums.aws.amazon.com/thread.jspa?threadID=153914