topic Re: Connecting to Qlik sense Server using .NET SDK in Integration, Extension & APIs

Connecting to Qlik sense Server using .NET SDK

Wed, 25 Nov 2015 12:15:34 GMT

Hi,

I am using qlik sense server version 2.1.1 and have .net sdk version also 2.1.1. I am trying to build a windows forms application which simply displays the server version. When I run the code, it gives me an error "unable to keep connection opened".

I am attaching the screenshot of error and below is my code.

private void Form1_Load(object sender, EventArgs e)

{

Uri uri = new Uri("https://abdullah-pc:4747"); // abdullah-pc is my server machine

ILocation location = Qlik.Engine.Location.FromUri(uri);

location.AsNtlmUserViaProxy();

using (IHub hub = location.Hub())

{

label1.Text = hub.ProductVersion();

}

If anyone helps, I'll be thankful.

AbdulRahman

Re: Connecting to Qlik sense Server using .NET SDK

Øystein_Kolsrud — Wed, 25 Nov 2015 12:28:00 GMT

Do you use virtual proxies? You might have to do a proxy setting on the location object. Something like this:

location.VirtualProxyPath = "myproxypath"

Re: Connecting to Qlik sense Server using .NET SDK

Wed, 25 Nov 2015 18:50:07 GMT

Hi Kolsrud,

Thanks for your quick reply. Actually I have installed sense server locally on my laptop. And I haven't configured any virtual proxy in it. but default virtual proxy set to Central is already setup. Attaching the screenshot.

One thing more, I use to give username, password each time when want to access qmc or hub. Also attaching the screenshot of that. may be it could be helpful resolving my issue. Also, I have added my machine name "Abdullah-PC" to web socket whitelist in virtual proxy.

Thanks

Re: Connecting to Qlik sense Server using .NET SDK

konrad_mattheis — Wed, 25 Nov 2015 19:47:33 GMT

Hi Abdul,

I think you use the wrong uri:

just remove the :4747

Uri uri = new Uri("https://abdullah-pc/); // abdullah-pc is my server machine

bye

Konrad

Re: Connecting to Qlik sense Server using .NET SDK

Thu, 26 Nov 2015 05:20:39 GMT

Hello Konard,

I have tried that all things. like ws://localhost:4848, https://abdullah-pc:4244, https://localhost:4848, https://abdullah-pc. But same error popping out

AbdulRahman

Re: Connecting to Qlik sense Server using .NET SDK

konrad_mattheis — Thu, 26 Nov 2015 12:52:56 GMT

Hi Abdul,

it should work. I do the same with no problems. Please go through that checklist:

1. Qlik Sense Server on your PC Version 2.1.1

2. If you open Qlik Sense in "Internet Explorer" you can connect without any ssl error

3. please try just:

using (var db= new DebugConsole())

{

location = Qlik.Engine.Location.FromUri(new URI("https://abdullah-pc"));

location.AsNtlmUserViaProxy(ssl);

using (IHub hub = location.Hub())

{

label1.Text = hub.ProductVersion();

}

Please also add Screenshots and the output in the Console.

thx Konrad

Re: Connecting to Qlik sense Server using .NET SDK

Thu, 26 Nov 2015 18:42:18 GMT

Thanks Konard for your help. I am able to open qlik sense in IE 11. Also I have used DebugConsole() function and got a complete error trace. Attaching the text file of error description.

Re: Connecting to Qlik sense Server using .NET SDK

Thu, 26 Nov 2015 18:51:23 GMT

Sorry Konard,

I was unable to attach file. I am writing here the error log from console. ! !

### WebSocket Error: Object reference not set to an instance of an object. ### 43927528

### WebSocket Stack Trace: 43927528

at Qlik.Sense.Communication.Communication.Tcp.StreamFactory.NegotiateAsClient(ITcpClientWrapper tcpClient, Uri remoteUri, SslConnection sslConnection, Action`1 onComplete, Action`1 onError)

at Qlik.Sense.Communication.Communication.WebSocketProtocol.WebSocketHandler.<>c__DisplayClass6.<NewClientWebSocketAsync>b__4(ITcpClientWrapper client)

at Qlik.Sense.Communication.Communication.Tcp.TcpClientWrapperFactory`1.<>c__DisplayClass5.<NewAndConnectedTcpClient>b__4(IAsyncResult result)

### Failed to ensure open connection ### 43927528

### Failed attempt 1 ### 43927528

### Failure message: Failed to ensure open connection: One or more errors occurred.

### WebSocket Error: Object reference not set to an instance of an object. ### 43927528

### WebSocket Stack Trace: 43927528

at Qlik.Sense.Communication.Communication.Tcp.StreamFactory.NegotiateAsClient(ITcpClientWrapper tcpClient, Uri remoteUri, SslConnection sslConnection, Action`1 onComplete, Action`1 onError)

at Qlik.Sense.Communication.Communication.WebSocketProtocol.WebSocketHandler.<>c__DisplayClass6.<NewClientWebSocketAsync>b__4(ITcpClientWrapper client)

at Qlik.Sense.Communication.Communication.Tcp.TcpClientWrapperFactory`1.<>c__DisplayClass5.<NewAndConnectedTcpClient>b__4(IAsyncResult result)

### Failed to ensure open connection ### 43927528

### Failed attempt 2 ### 43927528

### Failure message: Failed to ensure open connection: One or more errors occurred.

### WebSocket Error: Object reference not set to an instance of an object. ### 43927528

### WebSocket Stack Trace: 43927528

at Qlik.Sense.Communication.Communication.Tcp.StreamFactory.NegotiateAsClient(ITcpClientWrapper tcpClient, Uri remoteUri, SslConnection sslConnection, Action`1 onComplete, Action`1 onError)

at Qlik.Sense.Communication.Communication.WebSocketProtocol.WebSocketHandler.<>c__DisplayClass6.<NewClientWebSocketAsync>b__4(ITcpClientWrapper client)

at Qlik.Sense.Communication.Communication.Tcp.TcpClientWrapperFactory`1.<>c__DisplayClass5.<NewAndConnectedTcpClient>b__4(IAsyncResult result)

### Failed to ensure open connection ### 43927528

### Failed attempt 3 ### 43927528

### Failure message: Failed to ensure open connection: One or more errors occurred.

### WebSocket Error: Object reference not set to an instance of an object. ### 43927528

### WebSocket Stack Trace: 43927528

at Qlik.Sense.Communication.Communication.Tcp.StreamFactory.NegotiateAsClient(ITcpClientWrapper tcpA first chance exception of type 'Qlik.Engine.Communication.CommunicationErrorException' occurred in Qlik.Engine.dll

Client, Uri remoteUri, SslConnection sslConnection, Action`1 onComplete, Action`1 onError)

at Qlik.Sense.Communication.Communication.WebSocketProtocol.WebSocketHandler.<>c__DisplayClass6.<NewClientWebSocketAsync>b__4(ITcpClientWrapper client)

at Qlik.Sense.Communication.Communication.Tcp.TcpClientWrapperFactory`1.<>c__DisplayClass5.<NewAndConnectedTcpClient>b__4(IAsyncResult result)

### Failed to ensure open connection ### 43927528

### WebSocket Error: Connection failed after 4 attempts. Unable to keep connection open: Failed to ensure open connection: One or more errors occurred. ### 43927528

Re: Connecting to Qlik sense Server using .NET SDK

Øystein_Kolsrud — Fri, 27 Nov 2015 11:29:09 GMT

Sounds like your Qlik Sense server is not set configured to utilize your windows credentials. You might want to look into the settings your QMC. For instance, have a look at the "User Directory Connectors" under "Manage Resources" and check that the relevant user directory is included there.

Re: Connecting to Qlik sense Server using .NET SDK

Øystein_Kolsrud — Fri, 27 Nov 2015 11:32:29 GMT

Since your server is running locally, it could also be possible for you to do a direct connection to it. So instead of doing "AsNtlmUserViaProxy" you would do "AsDirectConnection" like this:

location.AsDirectConnection(<your user directory name>, <your user id>);

But if you want to be able to use your application so that it can connect to non-local servers, then this is probably not your long term solution.

Re: Connecting to Qlik sense Server using .NET SDK

Fri, 27 Nov 2015 13:12:04 GMT

Hi,

are you running with the proxy? If so have you configured "Websocket origin white list" in your qmc (see Virtual proxies - Advanced), you can add your ip-adress or your domain (for example qlik.com).

It could also be issues with your certificate configuration, you can test to allow HTTP (see Proxies - Ports),

in this case you should use http://abdullah-pc

Best Regards

Lars-Göran Book

Re: Connecting to Qlik sense Server using .NET SDK

Mon, 30 Nov 2015 06:13:58 GMT

Hi Kolsurd,

I have tried this already as I have said. And I can see my user directory in manage resources under qmc. But still I am unable to achieve server version. Same error is popped out.

Also can you help me with manual reload a specific task or app in server, from aspx page using .net sdk or any other API.

Will be thankful,

Abdul Rahman

Re: Connecting to Qlik sense Server using .NET SDK

Wed, 02 Dec 2015 09:00:27 GMT

Hi,

regarding your reload task there is an example Script Reloader on Qlik Branch which migth be useful.

See ScriptReloader

Best reagrds

Lars-Göran Book

Re: Connecting to Qlik sense Server using .NET SDK

Thu, 21 Jan 2016 12:46:53 GMT

hello

Try to use location.AsNtlmUserViaProxy(proxyUsesSsl: true) (change your proxyUsesSsl to true.

Best regards

Re: Connecting to Qlik sense Server using .NET SDK

Fri, 22 Jan 2016 10:24:23 GMT

Hi,

I can see that you are using the port for the engine but when connecting you going to the proxy.

There should not be any port in the uri when connecting thru the proxy i.e.

Uri uri = new Uri("https://abdullah-pc");

Best Regards

Lars-Göran Book