topic Connection failed on NPrinting engines in Qlik NPrinting

Connection failed on NPrinting engines

Thu, 11 May 2017 09:25:13 GMT

Hi All,

I just installed a Nprinting Server 17.3.1 and Engine on a server, I encountered “Connection failed on all NPrinting engines” in the connection status and "Error request has been purged due to connection errors" in the Cache Status when create my first connection, checked the engine status is Online, and my account id also has the QlikView user cal, I also tested the local path but it raised the same error.

Checked the Engine log file, found the below error information.

Error while trying to add a resolver for connection navigator=qlikview;documentpath=qvp://xxx/xxx.qvw;username=xxx\xxx;encryptedpassword="xxxx".

ERROR: An exception was thrown while invoking the constructor 'Void .ctor(Engine.Navigator.QlikView.QlikViewConnectionString, Engine.Navigator.QlikView.IQlikViewPool)' on type 'QlikViewContentNavigator'. ---> Exception has been thrown by the target of an invocation. (See inner exception for details.) Inner exception: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.BadImageFormatException: Could not load file or assembly 'Engine.Navigator.QlikView, Version=1.0.0.0, Culture=neutral, PublicKeyToken=aa3e5cc00a2bd1f0' or one of its dependencies.

Could you please help?

Thanks a lot!

Paul Wu

Re: Connection failed on NPrinting engines

Danijel — Thu, 11 May 2017 14:50:39 GMT

I have the same problem. After Upgrade to 17.3.1 i can't connect to the engine.

Also the services "Qlik NPrinting Scheduler" and "QlikNPrintingMessagingService" can not be started.

I tried to restart the services and the server. Un- and install the Engine were not successful..

Maybe a bug in 17.3.1?

Re: Connection failed on NPrinting engines

Thu, 18 May 2017 06:21:38 GMT

Anybody can help? Thanks a lot.

Re: Connection failed on NPrinting engines

Danijel — Thu, 18 May 2017 06:35:19 GMT

Hey Paul Wu,

i could now start the services..

My solution, Update .net Framework to 4.62..

Re: Connection failed on NPrinting engines

Thu, 18 May 2017 09:59:18 GMT

Hi Danijel,

Congratulation! but the it still show the same error after upgrading the .Net Framwork to 4.62 on my server.

Re: Connection failed on NPrinting engines

Danijel — Thu, 18 May 2017 10:23:29 GMT

Also run all services? What helped me too:

NPrinting Scheduler cannot be started and/or NPrinting Engine shows Offline in the NPrinting Web Console

In this case this might indicate a configuration issue during the NPrinting Installation.

In order to troubleshoot this issue you can look at the Scheduler logs for Error: RabbitMQ message broker is unreachable Shutting down scheduler service.

You can then open the Rabbit CMD (or CMD → cd C:\Program Files (x86)\RabbitMQ Server\rabbitmq_server-3.5.7\sbin) and type

rabbitmqctl.bat list_permissions

If following lines are displayed:

Listing permissions in vhost "/" ...

guest .* .* .*

Instead of

Listing permissions in vhost "/" ...

guest .* .* .*

remote .* .* .*

Then you can run the following two command in the same CMD Prompt in order to create the "remote" user used by NPrinting

rabbitmqctl.bat add_user remote remote to create the remote user

rabbitmqctl.bat set_permissions remote ".*" ".*" ".*" (do not forget quotes) to give it permissions

After a service restart everything should work

Re: Connection failed on NPrinting engines

Anonymous — Thu, 27 Jul 2017 12:01:00 GMT

I have the same problem too,

did anybody solve this issue?

Re: Connection failed on NPrinting engines

nathanfurby — Tue, 10 Oct 2017 09:08:06 GMT

For future reference: this issue was resolved for me by leasing a QlikView Desktop licence on the server. Logging on to the server with the nprinting service account.

You can view any errors when you verify the connection:

- Apps > Connections

- Click the Connection name

- Click on 'Run verification'

- You can then see the details: