topic Re: Qlik Sense Engine not reachable from NPrinting Engine in Qlik NPrinting

Qlik Sense Engine not reachable from NPrinting Engine

cpalbrecht — Wed, 25 Sep 2019 18:40:54 GMT

Hi,

I am trying to connect a NPrinting Engine with a Sense Engine. I followed all instructions. But I get one last error:

The log says:

*** PerformDiagnosis found a problem: Valid Sense Engine qlik-sense is not reachable on port 4747

After reading a lot here in the community, I validated the following things:

I installed again the certificates with the machine_name.windows_domain_name
I opened only for testing all ingoing ports on the sense machine and all outgoing ports on sense machine
Both machines are in the same Windows domain
Qlik Sense and NPrinting both running with the same domain user:

the Winddows domain user has RootAdmin rights:

From the NPrinting machine I can also open the Qlik Sense Hub and the app, I can export data from there and so on.
I restarted both machines multiple times.
I added the NPrinting machine name (with and without domain name), the proxy address and the ip addresses of both machines to the White List of the virtual proxy of Qlik Sense.

Does anybody have an idea what the problem could be?

Re: Qlik Sense Engine not reachable from NPrinting Engine

Ruggero_Piccoli — Mon, 11 Jun 2018 14:39:39 GMT

Hi,

Based on your message and the error description here https://help.qlik.com/en-US/nprinting/April2018/Content/Troubleshooting/Verify-connection-to-Sense-errors.htm you did everything correct.

Do you have a multi-node Qlik Sense installation? If yes check that the firewall is open on all computers with Qlik Sense Engine.

Was the connection cache generated? Did you try to generate it?

Best Regards,

Ruggero

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Re: Qlik Sense Engine not reachable from NPrinting Engine

cpalbrecht — Mon, 11 Jun 2018 14:47:25 GMT

Cache status is Error.

I have a Single Node Installation for Qlik Sense. Qlik Sense and Nprinting are both the latest version.

I had Qlik Sense before. For NPrinting I configured another Windows Server and I created a Windows domain. After that, I added the existing Qlik Sense Windows machine to that domain. So Qlik Sense was not in a domain before. Could that be a problem? Something with windows user and so on?

After trying to generate the cache, the NPrinting Engine Log says:

Engine.Navigator.QlikSense.SDK 1.0.0.0 Engine.Navigator.QlikSense.QlikSenseDiagnose 20180611T144234.989+00:00 ERROR QLIK-NPRINT 0 0 0 0 0 0 0 0 *** PerformDiagnosis found a problem: Valid Sense Engine qlik-sense is not reachable on port 4747.

Engine.Navigator.QlikSense.SDK 1.0.0.0 Engine.Navigator.QlikSense.SDK.SenseNavigator 20180611T144327.879+00:00 ERROR QLIK-NPRINT 0 0 0 0 0 0 0 0 Failed to initialize Sense Navigator. ERROR: Qlik.Sense.JsonRpc.CommunicationErrorException: Connection failed after 4 attempts. Error message:↓↓ No such host is known↓↓ No such host is known↓↓ No such host is known↓↓ No such host is known↓↓ 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 Qlik.Engine.LocationExtensions.AppWithIdOrDefault(ILocation location, String appId, Nullable`1 noVersionCheck)↓↓ at Engine.Navigator.QlikSense.SDK.SenseNavigator.OpenApp()↓↓ at Engine.Navigator.QlikSense.SDK.SenseNavigator..ctor(QlikSenseConnectionString connectionString, RenderingManager renderingManager)

Qlik.NPrinting.Engine 18.9.5.0 Qlik.NPrinting.Engine.Consumer.ConnectionResolvers 20180611T144327.880+00:00 WARN QLIK-NPRINT 0 0 0 0 0 0 0 0 Failed to open a resolver for connection navigator=qliksense;proxyurl=https://qlik-sense.qlikaws.domain.internal/;appid=0e3e54a6-858a-4346-ab10-7b75ac2b3316;identity=QLIKAWS\Administrator. ERROR: Qlik.Sense.JsonRpc.CommunicationErrorException: Connection failed after 4 attempts. Error message:↓↓ No such host is known↓↓ No such host is known↓↓ No such host is known↓↓ No such host is known↓↓↓↓Server 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 Qlik.Engine.LocationExtensions.AppWithIdOrDefault(ILocation location, String appId, Nullable`1 noVersionCheck)↓↓ at Engine.Navigator.QlikSense.SDK.SenseNavigator.OpenApp()↓↓ at Engine.Navigator.QlikSense.SDK.SenseNavigator..ctor(QlikSenseConnectionString connectionString, RenderingManager renderingManager)↓↓ at Engine.Navigator.QlikSense.SDK.SenseNavigatorFactory.GetSenseNavigator(QlikSenseConnectionString connectionString)↓↓ at Engine.Navigator.QlikSense.QlikSenseContentNavigator.<>c__DisplayClass2.<.ctor>b__0(ISenseNavigatorFactory nf)↓↓ at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()↓↓ at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source, Func`2 predicate)↓↓ at Engine.Navigator.QlikSense.QlikSenseContentNavigator..ctor(QlikSenseConnectionString connectionString, IEnumerable`1 navigatorFactories)↓↓ at lambda_method(Closure , Object[] )↓↓ at Autofac.Core.Activators.Reflection.ConstructorParameterBinding.Instantiate()↓↓↓↓Exception rethrown at [0]: ↓↓ at System.ExceptionExtensions.RethrowInnerException(Exception this, Boolean ifInnerExceptionIsNullRethrowThis) in c:\Jws\release-18.9.x\server\NPrinting\src\Qlik\Qlik.Reporting.Common\System\ExceptionExtensions.cs:line 264↓↓ at Qlik.NPrinting.Engine.Consumer.ContentResolverFactory.Get(Guid engineId, String connectionString, IRequestBuffer buffer, Int32 initialMaxBatchSize, CancellationToken cancToken) in c:\Jws\release-18.9.x\server\NPrinting\src\Engine\Consumer\ContentResolverFactory.cs:line 34↓↓ at Qlik.NPrinting.Engine.Consumer.ConnectionResolvers.TryOpenResolver(Int32 initialMaxBatchSize, CancellationToken cancToken) in c:\Jws\release-18.9.x\server\NPrinting\src\Engine\Consumer\ConnectionResolvers.cs:line 252

Re: Qlik Sense Engine not reachable from NPrinting Engine

cpalbrecht — Mon, 11 Jun 2018 15:17:50 GMT

The hostname of the Qlik Sense node is not the full computer_name.windows_domain_name. Its only the computer name. Could that be the issue?

Re: Qlik Sense Engine not reachable from NPrinting Engine

Ruggero_Piccoli — Mon, 11 Jun 2018 15:26:12 GMT

Hi,

The log says "Valid Sense Engine qlik-sense is not reachable on port 4747.", so I suggest to check again the firewall settings.

Just to try, you could disable the firewall on both Qlik Sense Engine computer and Qlik NPrinting Engine computer and see what happens. After you can switch on the firewall again.

Best Regards,

Ruggero

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Re: Qlik Sense Engine not reachable from NPrinting Engine

cpalbrecht — Mon, 11 Jun 2018 15:37:47 GMT

That is also not working 😕

Re: Qlik Sense Engine not reachable from NPrinting Engine

cpalbrecht — Mon, 11 Jun 2018 15:41:58 GMT

But as I said before, when I am creating the cache status, in the log I can find:

Failed to open a resolver for connection navigator=qliksense;proxyurl=https://qlik-sense.qlikaws.domain.internal/;appid=0e3e54a6-858a-4346-ab10-7b75ac2b3316;identity=QLIKAWS\Administrator. ERROR: Qlik.Sense.JsonRpc.CommunicationErrorException: Connection failed after 4 attempts. Error message:↓↓ No such host is known↓↓ No such host is known↓↓ No such host is known↓↓

Maybe there is a DNS problem? But as I also said, I can reach the Qlik Sense Hub from browser:

https://qlik-sense.qlikaws.domain.internal/

Re: Qlik Sense Engine not reachable from NPrinting Engine

Ruggero_Piccoli — Mon, 11 Jun 2018 15:42:53 GMT

Hi,

I have not other suggestions.

Please open a support ticket so a support guy can connect with you.

Best Regards,

Ruggero

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Re: Qlik Sense Engine not reachable from NPrinting Engine

Ruggero_Piccoli — Mon, 11 Jun 2018 16:05:00 GMT

You can reach the Qlik Sense server via browser so the address resolution seems to work.

The first error that appears is the one about the 4747 port?

In my opinion you should start from the resolution of the first error that appears because following errors could ba a consequence of the first one.

Best Regards,

Ruggero

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Re: Qlik Sense Engine not reachable from NPrinting Engine

cpalbrecht — Tue, 12 Jun 2018 12:51:24 GMT

I tried also the Test-NetConnection‌ which you mentioned on another discussion. It shows, that the connection should bepossible via port 4747:

Re: Qlik Sense Engine not reachable from NPrinting Engine

Ruggero_Piccoli — Tue, 12 Jun 2018 13:00:06 GMT

Good! I supposed there was a problem in the connection that is different than a firewall setting.

Re: Qlik Sense Engine not reachable from NPrinting Engine

anna_ — Wed, 19 Jun 2019 09:23:50 GMT

Hi,

I am experiencing the same problem at the moment, NPrinting was working fine with our Qlik Sense, but suddenly since a month I always get the error message for "All Qlik Sense engines are reachable from the Qlik NPrinting Engine computers." when trying to reload the metadata or set up a new connection.

In the log it says: Failed to open a resolver for connection navigator=qliksense

Firewalls are disabled on both the QS-Server as well as the NPrinting Server.

I've already opened a support ticket a month ago, but well, no helpful answer from them so far....

Did you solve your problem and if yes, what was it?

Would be happy to hear from you!

Many regards,

Anna

Re: Qlik Sense Engine not reachable from NPrinting Engine

witty — Thu, 11 Jul 2019 17:36:11 GMT

We are having the same exact issue - tested firewall, checked ports on the console, doubled checked users...

Any better resolution on this? Tips?

Re: Qlik Sense Engine not reachable from NPrinting Engine

Frank_S — Thu, 11 Jul 2019 17:44:17 GMT

If the ports are opened as per below between NP server and QS server then I would next check your proxy/virtual proxy to determine if any of the default ports/advanced config settings have been changed.

http://rd-docloc.rdlund.qliktech.com/LD/en-US/nprinting/June2019/Content/NPrinting/DeployingQVNprinting/Ports.htm

Keep in mind that you also need your network/AWS/Azure firewalls to allow the required NPrinting port communication and not just the ports on your Qlik Sense and NPrinting server computers.

I suggest starting a support case with your Qlik support partner or the Qlik Support desk if needed so a closer look at your NPrinting and possibly your Qlik Sense logs.

I've copied the port exclusions below for your convenience.

Firewall rules

These ports need to be open inbound on the Qlik NPrinting Server to allow access from web browsers and Qlik NPrinting Designer:

4993
4994

These ports need to be open inbound on the Qlik Sense server, and outbound on Qlik NPrinting Server and Qlik NPrinting Engines:

4242
4243
4747

This port needs to be open outbound on Qlik NPrinting Engines if Qlik NPrinting scheduler service and Qlik NPrinting Engine are installed on different machines:

5672

This port needs to be open inbound on the Qlik NPrinting scheduler service if Qlik NPrinting scheduler service and Qlik NPrinting Engine are installed on different machines:

5672

This port needs to be open inbound on QlikView Management Server (QMS), if a cluster is used:

4799

This port needs to be open outbound on Qlik NPrinting Server and inbound on all Qlik NPrinting Engines:

4997

Re: Qlik Sense Engine not reachable from NPrinting Engine

witty — Thu, 11 Jul 2019 18:32:26 GMT

The machines in question are on the same VPC, all connections allowed. We have added firewall rules, disabled firewalls, etc no awail.

both other users posted the same scenario and questioning and never had a successful comment to try something else than a firewall @cpalbrecht did you ever get this resolved?

Engine.Navigator.QlikSense.SDK 19.19.4.0 Engine.Navigator.QlikSense.SDK.QlikSenseDiagnose 20190710T235929.900+00:00 ERROR <machine> 0 0 0 0 0 0 0 0 PerformDiagnosis found a problem. ERROR: System.Exception: Valid Sense Engine <machine> is not reachable on port 4747. ↓↓ at Engine.Navigator.QlikSense.SDK.QlikSenseDiagnose.<>c__DisplayClass1_0.b__10()↓↓ at Engine.Navigator.QlikSense.SDK.QlikSenseDiagnose.<>c__DisplayClass1_0.b__0(DiagnoseStep step, Action proc)

Re: Qlik Sense Engine not reachable from NPrinting Engine

witty — Thu, 11 Jul 2019 18:45:38 GMT

Filed a case 01681323

Re: Qlik Sense Engine not reachable from NPrinting Engine

Frank_S — Thu, 11 Jul 2019 18:48:12 GMT

@witty

Did you notice my very first comment about checking if your default port configurations on QS have changed?

"If the ports are opened as per below between NP server and QS server then I would next check your proxy/virtual proxy to determine if any of the default ports/advanced config settings have been changed."

If your any of your logs indicate that certain ports are not reachable then something may have been changed on your QS server.

Again, I suggest checking that and if nothing has changed there, to start a support ticket to have this investigated further.

Once you receive assistance and a resolution from a member of our team, it would be greatly appreciated if you could return to this thread and mentioned what the resolution is.

Note that resolutions may be different for each different site due to domain or other security requirements and perhaps the use of multi-domains in an NP and Qlik Sense deployment (which is actually not supported). As a result there may be different solutions for the same reported error for different organizations.

Thank you...

Re: Qlik Sense Engine not reachable from NPrinting Engine

witty — Thu, 11 Jul 2019 18:55:18 GMT

Hi @Frank_S ,

we did check and yes the ports on the QS are the default and have not changed (4747, 4243, 4242)

if we ever find out what it was i definitely will publish this here.

we have checked the admin user on nprinting has access to the app in question via the QS hub; he has a capacity license applied.

does it matter that the QS has a signed JWT license key for analyzer capacity and the NPrinting one has a legacy one (license key and control number)?

is it an issue that we started in a workgroup and then joined the QS server to the domain (we set up an AD just for NPrinting) as generally we manage users with a custom solution so have no need for the AD - NPrinting forced us to setup an AD (which btw is not amazing)

we have all the same ticks on the connection test as the first post in this thread and did the same powershell / cmd ping to 4747

Re: Qlik Sense Engine not reachable from NPrinting Engine

Frank_S — Thu, 11 Jul 2019 21:52:10 GMT

@witty

We can't be certain until we have a closer look.

However yes if you are using a later version of Qlik Sense, the License model 'might' be having an impact. (I don't think the QS JWT cert should be a problem.)

Check this article re: the license model and QS April 2019 SR 1 https://support.qlik.com/articles/000076435

In the meantime, you can also a check the following article as well to double check the additional points that might help to resolve this as well.

How to Resolve the NPrinting 17+ platform verification errors

If the above doesn't help, please defer to the support case you submitted going forward until a resolution is found. Once that process is complete, if you could then please return here and share the solution it would be greatly appreciated.

Kind regards...

Re: Qlik Sense Engine not reachable from NPrinting Engine

anna_ — Mon, 15 Jul 2019 08:15:13 GMT

Hi,

here an update from my side: After two months searchng for the reason why the engine can't connect, I finally uninstalled NPrinting and re-installed it from Scratch - now it works again.

Sorry I can't give you any better advice.

Anna