C# - Authentication Failed Between Client And WCF Service?

I have a WCF service hosted on an external server (other domain) and I'm trying to consume it from a command line application. I receive the following error:

The request for security token could not be satisfied because authentication failed.

The service is configured inside a web.config file:

<system.serviceModel>
<bindings>
<wsHttpBinding>
<binding name="wsHttpBinding_IRun">

[Code]....

On the client side, I create a custom binding to connect to the service. Here is the security configuration:

standardBinding.Security.Mode = SecurityMode.None;
standardBinding.Security.Transport.ClientCredentialType = HttpClientCredentialType.None;
standardBinding.Security.Transport.ProxyCredentialType = HttpProxyCredentialType.None;
standardBinding.Security.Transport.Realm = "";
standardBinding.Security.Message.ClientCredentialType = MessageCredentialType.None;
standardBinding.Security.Message.NegotiateServiceCredential = false;
standardBinding.Security.Message.EstablishSecurityContext = false;
standardBinding.Security.Message.AlgorithmSuite = SecurityAlgorithmSuite.Default;

I'm not using any security mechanism for authentification but still, the service seems to be expecting one. When working on different domains, is it mandatory to use a basic authentification?

EDIT: I wasn't referencing any binding configuration at my endpoint. Once the reference was set, I received another message error:

{"The message with Action 'http://schemas.xmlsoap.org/ws/2005/02/trust/RST/Issue' cannot be processed at the receiver, due to a ContractFilter mismatch at the EndpointDispatcher. This may be because of either a contract mismatch (mismatched Actions between sender and receiver) or a binding/security mismatch between the sender and the receiver. Check that sender and receiver have the same contract and the same binding (including security requirements, e.g. Message, Transport, None)."}

The issue was caused by my client's binding. While I was creating my custom binding using the standard 'WSHttpBinding', the 'SecurityMode' property was set to 'Message' instead of 'None'. Now the code looks like the following and the service finally works:

WSHttpBinding standardBinding = new WSHttpBinding(SecurityMode.None, false);
CustomBinding myCustomBinding = new CustomBinding(standardBinding);