Why can't I connect to a WCF service with net.tcp but i can with http

Could not connect to net.tcp://zzz.xxx.yyy/MyService.svc.
The connection attempt lasted for a time span of 00:00:01.0464395.
TCP error code 10061: No connection could be made because the target machine
actively refused it x.x.x.x:808.

binding.Security.Message.ClientCredentialType = MessageCredentialType.None;
binding.Security.Message.ClientCredentialType = TcpClientCredentialType.Windows;,

binding.MaxReceivedMessageSize = maxMessageSize;
binding.ReaderQuotas.MaxArrayLength = maxMessageSize;

You have tried to create a channel to a service that does not support .Net
Framing. It is possible that you are encountering an HTTP endpoint.