Heroku PostgreSQL无法连接到服务器:连接超时

我正在尝试使用 heroku pg:psql postgresql-rigid-33416 --app murmuring-ocean-62645 ,但是我收到了这个消息

--> Connecting to postgresql-rigid-33416
psql: could not connect to server: Connection timed out (0x0000274C/10060)
        Is the server running on host "ec2-50-17-225-140.compute-1.amazonaws.com" (50.17.225.140) and accepting
        TCP/IP connections on port 5432?

我试图关闭防火墙,但问题仍然存在。知道怎么解决这个问题吗?

编辑:

heroku version
heroku/7.16.0 win32-x64 node-v10.10.0

heroku pg:info
=== DATABASE_URL
Plan:                  Hobby-dev
Status:                Available
Connections:           0/20
PG Version:            10.5
Created:               2018-10-09 14:03 UTC
Data Size:             7.6 MB
Tables:                0
Rows:                  0/10000 (In compliance)
Fork/Follow:           Unsupported
Rollback:              Unsupported
Continuous Protection: Off
Add-on:                postgresql-rigid-33416