Connecting to remote mysql works in terminal, not via PHP PDO script

Question

I am facing a weird problem here we have a server A where the app files are stored and B server with database

Tried to connect via command prompt from server A to B

Answer 1

Try specifying the port in your connection string and ensure the database server is set to allow remote connections and the port is open on your firewall (both of these I suspect are already done as you are able to connect via the terminal but it never hurts to verify and check things).

Change your PDO connection and add the port=3306 or if you're using MAMP use port 8889

$this->db=new PDO('mysql:host=xx.xx.xx.xx;port=3306;dbname=databasename','root','password');

Another thing to check is if – SELinux is blocking network connections. Login as root and run

setsebool -P httpd_can_network_connect=1