Error establishing a database connection on wordpresss

Question

I got this error while running my WordPress project:

Error establishing a database connection This either means that the 
username and password information in your wp-config.php file is 
incorrect or we can't contact the database server at %s. This could 
mean your host's database server is down.

How can I solve this error? Please help. Thanks in advance.

Answer 1

You have to specifically add your port number in the field if you are not using 3306(Default).

As seen in this image