Connection to remote MySQL error:
ERROR 2003 (HY000): Can’t connect to MySQL Server ‘IP’ (113)
View error types (Linux system)

perror 113

The results are as follows:
OS error code 113: No route to host
The reason for this error is that the server-side firewall does not open the port used by the MySQL program. By default, it is 3306 and the open port is ok

/sbin/iptables -I INPUT -p tcp --dport 3306 -j ACCEPT 

Save the Settings and restart the firewall

service iptables save
service iptables restart