Value cannot be null. Parameter name: source in sdk 10.2.7

Question

I had written an application a few years ago using .net sdk 10.2.7. It was working fine a few years ago. i came back to trying to use it now,but when it try it now. it is giving an error of Value cannot be null. Parameter name: source when calling the Dim routeResult = Await routeTask.SolveAsync(routeParams)

Was something changed in the API?

murrayGordon · Answer

Forcing TLS 1.2 via

System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12 and switching the project to .Net Framework 4.7 doesn't seem to help.

SomeGISGuy · Answer

Is it because TLS1.2 was turned on recently and your app isn't set up to support it?

https://community.esri.com/community/esri-software-security-privacy/blog/2018/11/15/important-update-for-arcgis-and-tls

Transport Layer Security (TLS) best practices with the .NET Framework | Microsoft Docs

murrayGordon · Answer

It does appear related to the authentication. I am using the code below.

Private ArcGISOnineUser As String = "xyz"
        Private ArcGISOninePassword As String = "xyz"

Public Sub New()

Esri.ArcGISRuntime.ArcGISRuntimeEnvironment.ClientId = "xyz"
            Esri.ArcGISRuntime.ArcGISRuntimeEnvironment.Initialize()

InitializeComponent()

IdentityManager.Current.ChallengeHandler = New ChallengeHandler(AddressOf CreateHardCodedCredentialAsync)

end sub

Private Async Function CreateHardCodedCredentialAsync(requestInfo As CredentialRequestInfo) As Task(Of Credential)
            Dim cred As Credential = Nothing
            Try
                Dim options = New GenerateTokenOptions()
                options.TokenAuthenticationType = TokenAuthenticationType.ArcGISToken
                cred = Await IdentityManager.Current.GenerateCredentialAsync(requestInfo.ServiceUri, ArcGISOnineUser, ArcGISOninePassword, options)
            Catch webEx As ArcGISWebException
                ' couldn't generate a token, probably a bad login  
                MessageBox.Show("Unable to log in to ArcGIS Online: " + webEx.Message)
            End Try
            Return cred
        End Function

After some investigation it seems that GenerateCredentialAsync never seems to return anything and the task seems to run indefinitely.

as a test it tried having it wait for the task completion

Dim cred As Task(Of Credential) = CreateHardCodedCredentialAsync2("https://www.arcgis.com/sharing/rest")
            Try
                cred.Wait()
            Catch ex As Exception
                MsgBox(ex.Message)
            End Try

In this case it would just be stuck on cred.Wait() forever

CreateHardCodedCredentialAsync2 is just there to replace the requestInfo.ServiceUri

I tried running the sample in  https://github.com/Esri/arcgis-runtime-samples-dotnet/tree/10.2.7/src/Desktop/ArcGISRuntimeSamplesDesktop/Samples/Security/OAuthAuthorization, but when i clicked sign in all it did is display a page saying

Invalid redirect_uri

Error: 400i left the default         private const string StandardAppDesktopRedirectUri = "urn:ietf:wg:oauth:2.0:oob"; as i don't have a landing page.and just filled in my client id.