Can't connect to MySQL server on 'XXXXXXXXX' (10060)

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C++

MySQL

Ok i have tried to search on google for the answers but i still cant fix this problem.
i have this error when trying to connect to the localhost

Can't connect to MySQL server on 'localhost' (10060)

i have fix it by changing the name 'localhost' to 127.0.0.1

so i tried to do same thing to my database online

i have the same problem...

Can't connect to MySQL server on 'XXX.domain.com' (10060)

i changed it to ip of host but still have the problem..

Can't connect to MySQL server on 'XXX.XXX.XXX.XXX' (10060)

any idea how to solve this ?

this is the code i use

MYSQL *conn;

 conn = mysql_init(NULL);

 if (conn == NULL) {
     printf("Error %u: %s\n", mysql_errno(conn), mysql_error(conn));
     exit(1);
 }

 if (mysql_real_connect(conn, "xxx.xxx.xxx.xxx", "xxxxxxx_xxxxxx",
         "xxxxxxxxx", NULL, NULL, NULL, 0) == NULL) {
     printf("Error %u: %s\n", mysql_errno(conn), mysql_error(conn));
 }else
 {
       printf("success !!");
 }

thanks