'Cassandra virtualbox error no connection could be made because the target machine actively refused it

I have cassandra install on the virtualbox and connect to c# application with the address, datacenter name correctly but still get the error. Is there anything that I miss and neede to be checked?

    public ISession session;
    private string IP = "127.0.0.1";
    private string Datacenter = "datacenter1";
    public ISession getConnect()
    {
        return session = Cluster.Builder()
                             .AddContactPoints(IP)
                             .WithPort(9042)
                             .WithLoadBalancingPolicy(new DCAwareRoundRobinPolicy(Datacenter))
                             .Build()
                             .Connect();
    }

cassandra virtualbox

Solution 1:^[1]

Check in virtualbox where Cassandra is listening: netstat -tlnp | grep 9042

try establish a connection using telnet: telnet <ip-addr> 9042

more detail here: https://community.datastax.com/questions/9242/native-transport-port-open-or-not.html

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Solution	Source
Solution 1	Adelino Silva

'Cassandra virtualbox error no connection could be made because the target machine actively refused it

Solution 1:[1]

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Solution 1:^[1]