linux apache and mysql

thank you very much for the reply. yes I had taken measures of iptables as both 6.5 sugar and 7.5 are on same esxi host as a vm's hence firewall( iptables) and selinux all are disabled and connectivity there found to be no issues.  root login validation found to be successful but data base does not get created also it is set with complete privileges,   the error while pointing the 7.5 to 6.5 mysql server was access denied I have allowed mysql root users login from remote on 6.5 think should also execute the below commands in 6.5 mysql server
6.5 server ip is 192.168.1.251 , please suggest should I have to execute the below on 6.5 where 192.168.1.235 is sugar 7.5
GRANT ALL PRIVILEGES ON database_name.* TO 'username'@'192.168.1.235' IDENTIFIED BY 'some_password';
FLUSH PRIVILEGES;

Please suggest is the above correct ones as this is production server

thanks in advance