[BUG] Hang on Configure and Authenticate

[dmarlow]

Describe the bug
Thread hangs when calling this:

Azure.Configure()
  .Authenticate(credentials)
  .WithDefaultSubscription();

Exception or Stack Trace
Here's what I see when I hit pause in VS:

Microsoft.Rest.ClientRuntime.dll!Microsoft.Rest.ServiceClient<Microsoft.Azure.Management.Graph.RBAC.Fluent.GraphRbacManagementClient>.InitializeHttpClient(System.Net.Http.HttpClient httpClient, System.Net.Http.HttpClientHandler httpClientHandler, System.Net.Http.DelegatingHandler[] handlers)	Unknown
Microsoft.Rest.ClientRuntime.dll!Microsoft.Rest.ServiceClient<System.__Canon>.ServiceClient(System.Net.Http.HttpClientHandler rootHandler, System.Net.Http.DelegatingHandler[] handlers)	Unknown
Microsoft.Azure.Management.ResourceManager.Fluent.dll!Microsoft.Azure.Management.ResourceManager.Fluent.Core.FluentServiceClientBase<Microsoft.Azure.Management.Graph.RBAC.Fluent.GraphRbacManagementClient>.FluentServiceClientBase(string baseUri, Microsoft.Azure.Management.ResourceManager.Fluent.Core.RestClient restClient)	Unknown
Microsoft.Azure.Management.Graph.RBAC.Fluent.dll!Microsoft.Azure.Management.Graph.RBAC.Fluent.GraphRbacManagementClient.GraphRbacManagementClient(string baseUri, Microsoft.Azure.Management.ResourceManager.Fluent.Core.RestClient restClient)	Unknown
Microsoft.Azure.Management.Graph.RBAC.Fluent.dll!Microsoft.Azure.Management.Graph.RBAC.Fluent.GraphRbacManager.GraphRbacManager(Microsoft.Azure.Management.ResourceManager.Fluent.Core.RestClient restClient, string tenantId)	Unknown
Microsoft.Azure.Management.Graph.RBAC.Fluent.dll!Microsoft.Azure.Management.Graph.RBAC.Fluent.GraphRbacManager.Authenticate(Microsoft.Azure.Management.ResourceManager.Fluent.Core.RestClient restClient, string tenantId)	Unknown
Microsoft.Azure.Management.Fluent.dll!Microsoft.Azure.Management.Fluent.Azure.Authenticated.Authenticated(Microsoft.Azure.Management.ResourceManager.Fluent.Core.RestClient restClient, string tenantId)	Unknown
Microsoft.Azure.Management.Fluent.dll!Microsoft.Azure.Management.Fluent.Azure.Configurable.Microsoft.Azure.Management.Fluent.Azure.IConfigurable.Authenticate(Microsoft.Azure.Management.ResourceManager.Fluent.Authentication.AzureCredentials credentials)	Unknown

To Reproduce
I'm not sure this is something that happens to everyone. This surely must be isolated to me, but I can't figure out how to diagnose it further. I was taking the code from here: https://github.com/Azure-Samples/network-dotnet-manage-network-security-group/blob/master/Program.cs

and trying it from a console app in the same way.

Code Snippet

var credentials = SdkContext.AzureCredentialsFactory.FromServicePrincipal(
                clientId,
                clientSecret,
                tenantId,
                AzureEnvironment.AzureGlobalCloud);
var azure = Azure.Configure()
    .Authenticate(credentials)
    .WithDefaultSubscription();

Expected behavior
To not hang indefinitely when trying to configure and authenticate my Azure instance.

Setup (please complete the following information):

• OS: Win 10
• IDE : VS 2017
• .NET 4.7.1
• Version: Microsoft.Azure.Management.Fluent v1.25.0

Information Checklist
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• Repro Steps Added
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[dmarlow]

I think I found the cause. For anyone that runs into this, the solution is to upgrade some PackageReferences. I had this in my csproj:

<PackageReference Include="Microsoft.Rest.ClientRuntime">
  <Version>2.3.11</Version>
</PackageReference>
<PackageReference Include="Microsoft.Rest.ClientRuntime.Azure">
  <Version>3.3.12</Version>
</PackageReference>

Once I upgraded these to the following, things worked as expected:

<PackageReference Include="Microsoft.Rest.ClientRuntime">
  <Version>2.3.20</Version>
</PackageReference>
<PackageReference Include="Microsoft.Rest.ClientRuntime.Azure">
  <Version>3.3.19</Version>
</PackageReference>