topic Re: Unable to connect to QlikSense server through .NET SDK in Integration, Extension & APIs

Unable to connect to QlikSense server through .NET SDK

Anonymous — Fri, 13 Jan 2017 10:41:58 GMT

Hi,

I am trying to connect Qlik Sense server through dotnet sdk and getting below mentioned error:-

Qlik.Sense.JsonRpc.CommunicationErrorException: Connection failed after 4 attempts. Error message:

Value cannot be null.

I tried :-

location.AsNtlmUserViaProxy(proxyUsesSsl: uri.Scheme.Equals(Uri.UriSchemeHttps), loginCredentials: new NetworkCredential(username, password, domain));

Please help me to solve this issue.

Thanks,

Nayana

Re: Unable to connect to QlikSense server through .NET SDK

Øystein_Kolsrud — Fri, 13 Jan 2017 12:29:14 GMT

Can you provide a stack trace? It would be interesting to see where that "Value cannot be null" is coming from. I'm unable to reproduce it.

And what version of the SDK and Qlik Sense server are you using?

Re: Unable to connect to QlikSense server through .NET SDK

Anonymous — Mon, 16 Jan 2017 05:31:42 GMT

Hi Qystein ,Thank you for your reply,

I am using Qlik Sense Server version 2.2.4.0 for this. Here is the stack trace,

Stack Trace :-

at Qlik.Engine.Communication.QlikConnection.AwaitResponseTask(T task, String methodName, CancellationToken cancellationToken)

at Qlik.Engine.Communication.QlikConnection.Ping(Nullable`1 noVersionCheck)

at Qlik.Engine.LocationExtensions.Hub(ILocation location, ISession session, Nullable`1 noVersionCheck)

at Qlik.Engine.LocationExtensions.GetAppIdentifiers(ILocation location, Nullable`1 noVersionCheck)

at Login.Button1_Click(Object sender, EventArgs e) in c:\Qlik\Login.aspx.cs:line 21

at System.Web.UI.WebControls.Button.OnClick(EventArgs e)

at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)

at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)

at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)

at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)

at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Re: Unable to connect to QlikSense server through .NET SDK

Anonymous — Mon, 16 Jan 2017 05:43:26 GMT

I am using Visual Studio 2015, QlikSense Server version 2.2.4.0, Qlik Sense .net SDK 3.1,

and stack trace is,

at Qlik.Engine.Communication.QlikConnection.AwaitResponseTask(T task, String methodName, CancellationToken cancellationToken)

at Qlik.Engine.Communication.QlikConnection.Ping(Nullable`1 noVersionCheck)

at Qlik.Engine.LocationExtensions.Hub(ILocation location, ISession session, Nullable`1 noVersionCheck)

at Qlik.Engine.LocationExtensions.GetAppIdentifiers(ILocation location, Nullable`1 noVersionCheck)

at Login.Button1_Click(Object sender, EventArgs e) in c:\Qlik\Login.aspx.cs:line 21

at System.Web.UI.WebControls.Button.OnClick(EventArgs e)

at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)

at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)

at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)

at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)

at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Re: Unable to connect to QlikSense server through .NET SDK

Øystein_Kolsrud — Thu, 19 Jan 2017 13:57:12 GMT

And you're still seeing that "Value cannot be null" message? I'm still not able to reproduce that. Have you tried to connect to that server with the "Qlik Explorer for Developers" tool? Try and see if you get the same message there. That tool uses the.Net SDK under the hood. Instructions for downloading the tool can be found here:

Qlik Explorer for Developers is here!

Re: Unable to connect to QlikSense server through .NET SDK

Anonymous — Fri, 20 Jan 2017 05:47:58 GMT

Hi Qystein,

Thank You for your information. Let me try about this.

Thank You,

Nayana

Re: Unable to connect to QlikSense server through .NET SDK

Anonymous — Fri, 20 Jan 2017 06:24:51 GMT

credentials with passing domain\username and password :-same "value cannot be null" error,but when I use the same host directly copy and paste to URL I can authenticate the server using the same credentials. Please help me .

Re: Unable to connect to QlikSense server through .NET SDK

Anonymous — Fri, 20 Jan 2017 09:14:26 GMT

Hi Øystein ,

I have one doubt regarding QlikSense login process through dotnet,

for location.AsNtlmUserViaProxy(..) needs valid certificate ?? or without virtual proxy settings and without certificate we can authenticate qliksense server through our dotnet login page??

I am trying to authenticate server by passing username,passsword and domain ...through location.

Please guide me.

Thank You,

Nayana

Re: Unable to connect to QlikSense server through .NET SDK

Øystein_Kolsrud — Fri, 20 Jan 2017 11:32:35 GMT

You might be able to get more information if you activate debug logs in your C# program. Try add this line before the line that causes the failure:

var theConsole = new DebugConsole();

That will print to standard out. Or if you want to write to file instead, you can write like this:

var theConsole = new DebugConsole(new StreamWriter(<path to file>));

That debug output might provide more information.

Re: Unable to connect to QlikSense server through .NET SDK

Anonymous — Fri, 27 Jan 2017 06:59:06 GMT

Hi , I have one doubt regarding qliksense authentication.

Is it possible to authenticate the qliksense without certificates?Please help me.

Thanks,

Nayana

Re: Unable to connect to QlikSense server through .NET SDK

Øystein_Kolsrud — Fri, 27 Jan 2017 08:24:45 GMT

I believe that depends on the settings of the server you are connecting to, but typically you do not need certificates to connect with the SDK. The most common way of connecting is using NTLM authentication which pretty much hides most parts of how the authentication handshaking is handled.

Re: Unable to connect to QlikSense server through .NET SDK

Anonymous — Fri, 27 Jan 2017 10:14:07 GMT

thank You for your Reply. When I try NTLM authnetication I am following error:-

Connection failed after 4 attempts. Error message:

GeneralCommunicationException with communication error WebSocketConnectionNotAccepted and http error code 500

Re: Unable to connect to QlikSense server through .NET SDK

konrad_mattheis — Sat, 28 Jan 2017 15:33:19 GMT

Hi,

this can be also a IPv6 Problem. I had the same issue at a customer with DNS -> IPv6 resolution. If got the same error message. After using the IPv4 it was working fine.

bye Konrad

Re: Unable to connect to QlikSense server through .NET SDK

tarek_hashash — Mon, 11 Jun 2018 12:35:03 GMT

Hi ,

please check the default virtual proxy make it Windows Authentication .

if you still facing this issue , you can reach me by this mail : tarek.hashhash@yahoo.com.

thanks