AWS RDS 到 PgAdmin 保存属性时出错无法连接到服务器:超时已过期

AWS RDS to PgAdmin Error saving properties Unable to connect to server: timeout expired

简短描述:AWS RDS 将服务器连接到 PgAdmin 4、PostgreSQL 11

完成:我已经完成了与 this guy or to this aws guide 类似的操作,但是最后当我点击保存时它没有为我接受。而是给出以下

错误

Error saving properties 
Unable to connect to server: 
timeout expired

我尝试解决的问题:

Your account does not support the EC2-Classic Platform in this region. 
DB Security Groups are only needed when the EC2-Classic Platform is supported. 
Instead, use VPC Security Groups to control access to your DB Instances.

编辑入站规则 类型必须转向:所有流量和我的 IP。比它有效