Why does a 504 website error occur on a c nginx postgres server?

Question

PostgreSQL

Hello. I have a working site in docker on yii2 and postgres. When transferring to vds, I can't start it - it gives either a 504 error or a PDOException: SQLSTATE[08006] [7] timeout expired in /var/www/html/site.ru/vendor/yiisoft/yii2/db/Connection.php :705.
After the call stack:
Additional Information:
Array
(
[0] => 08006
[1] => 7
[2] => could not connect to server: No route to host
Is the server running on host "172.17.0.1" and accepting
TCP /IP connections on port 5432?
)
phpinfo() says pdo_pgsql is active, though version 9.2.24, while postgres on the server is 13. I don't know if that matters.
Another site on yii2 and mysql is running on this server. I can connect to postgres via pgadmin from my home computer, port 5432 is open and the postgresql service is added to the firewall exceptions.

Answer 1

172.17.0.1 - non-public address, how do you connect to it from your home computer?
Check which addresses the postgres server is hanging on.