Possible problems:
1. Firewall blocking,
Solution: log in to the server and turn off the firewall

systemctl stop firewalld.service

2. User empowerment (the root user I use here)
Solution: log in to the MySQL database for empowerment

grant all privileges on *.* to 'root'@'%' identified by 'password';
flush privileges;

3. Check whether the password is entered incorrectly