Azure DB for PostgreSQL flexible server always show connection time out, Is the server running on that host and accepting TCP/IP

Question

I built a Azure Database for PostgreSQL flexible server, and I did select "allow public access to this resource through the internet using a public IP address" and I did select "allow public access from any Azure service within service within Azure to this server" and in the firewall rule I added the allowed IP from 0.0.0.0 to 255.255.255.255. But When I connect the DB, it always show the error: psql: 错误: 连接到"thinkbot.postgres.database.azure.com" (52.149.145.12)上的服务器，端口5432失败：Connection timed out (0x0000274C/10060)

    Is the server running on that host and accepting TCP/IP connections?

So Whta wrong with the Azure DB?