I did everything right before the 4th step, as indicated on this page.
http://docs.amazonwebservices.com/AmazonRDS/latest/GettingStartedGuide/ConnectToDBInstance.html
But I can not use telnet and ping for the Endpoint server. What else should I check if I want to connect to this mysql server from another AWS EC2 instance?
I think you did not configure the RDS security group. Add the ec2 security group from which you want to access RDS to the RDS security group for this RDS.
By default, the RDS security group blocks all connections.
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