SSL connection fails when creating DurableSession.

#### Problem Description
HPC Pack .Net SDK (6.3.8022-beta)

*** Exception ***
The SSL connection could not be established, see inner exception.
The remote certificate was rejected by the provided RemoteCertificateValidationCallback.

#### Steps to Reproduce
var info = new SessionStartInfo(headnode, SERVICE_NAME)
{
SessionResourceUnitType = SessionUnitType.Core,
Secure = false,
Username = user,
Password = password,
//ServiceHangTimeout = 60 * 10
UseWindowsClientCredential = true,
TransportScheme = TransportScheme.NetTcp,
LocalUser = true
};

// Get System.Net.Http.HttpRequestException
DurableSession session = DurableSession.CreateSession(info);