远程数据库未与 Java 应用程序连接

Question

I have a java project and for that, I needed a remote database, I purchased a aws instance for public IP, installed MySql with PhpMyAdmin but the database is not connecting with the project via my public IP but if I use a ngrok port forward then it is connecting with the database, and the error its producting is:

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

please help!!

Working with Ngrok

Not working with public ip

Answer 1

Ensure that the database has a public endpoint (ping it for instance in order to see that it has a public address). Then just check security group permissions.