How to connect to MySQL with C++ and mysql++

I'm trying to retrieve data from my remote MySQL database from C++ under Ubuntu.

#include <mysql++.h>
#include <stdlib.h>
 
using namespace std;
using namespace mysqlpp;
 
int main() {
    
    cout << "Trying to connect..\n";

    try {
        Connection conn(false);
         conn.connect("Sql737674_5", "62.149.xxx.xxx", "Sql737674", "xxxxxxxxx");
        Query query = conn.query();
        
        if (conn.connected()){
        cout << "OK\n";
        } 
        else {
        cout << "NOT CONNECTED\n";
        }

        cout << "Eseguo Select\n";
        /* Now SELECT */
        query << "SELECT * FROM Utenti LIMIT 10";
        StoreQueryResult ares = query.store();
	cout << "Ciclo FOR\n";
       // printf("numero: %d", ares.num_rows());
        for (size_t i = 0; i < ares.num_rows(); i++){
	cout << "Name: " << ares[i]["Nome"] << " - Cognome: " << ares[i]["Cognome"] << endl;
         }
        
    } catch (BadQuery er) { // handle any connection or
        // query errors that may come up
        cerr << "Error: " << er.what() << endl;
        return -1;
    } catch (const BadConversion& er) {
        // Handle bad conversions
        cerr << "Conversion error: " << er.what() << endl <<
                "\tretrieved data size: " << er.retrieved <<
                ", actual size: " << er.actual_size << endl;
        return -1;
    } catch (const Exception& er) {
        // Catch-all for any other MySQL++ exceptions
        cerr << "Error: " << er.what() << endl;
        return -1;
    }
 
    return (EXIT_SUCCESS);
}

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The problem is that I'm not able to get any result and it seems that the connection can't be established.

I compile it with:

g++ -I/usr/include/mysql -I/usr/local/include/mysql++ -L/usr/lib test.cpp -lmysqlpp -lmysqlclient -lnsl -lz -lm -o test

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This is the output:

Trying to connect..
NOT CONNECTED
Eseguo Select
Ciclo FOR

I checked the connection data (IP, name, password) and they are OK, so it is not a problem with the authentication.

Can you help me, please?
I can't understand why it is not working.

P.S. I'm not forced to use mysql++, I can use any other library without problems.