Application fails to launch most of the time through Citrix Xenapp 7.5

We have an ERP system which is built on the Magic uniPaaS framework (not by us, it's a 3rd party solution, and we don't have the source code). We have recently moved the deployment of this application fully to Citrix Xenapp 7.5 (before we had some users working through Xenapp 5). We are using 2 application servers on which the application actually runs, a storefront server and a license server. Citrix is supposed to load balance the application across both application servers (we're using the software load balancer, we don't have Netscaler). All are virtual servers (HyperV) running Windows 2008 R2 as their OS.
This worked reasonably well for a few months, but it's always been a little fickle. Sometimes the application wouldn't start (it would show "connection established, negotiating capabilities" and then just close without launching the application). Sometimes we get a message that the server doesn't accept connections. Sometimes we get a message there's no citrix server configured on the specified address. While this used to be sporadic, since this week it's become virtually impossible to connect to the application. I'm not entirely sure what has changed, and the people who are supposed to manage Citrix internally do not have the necessary knowledge and skills to troubleshoot this issue (despite their claims to the contrary). My Citrix knowledge is limited, but I can't sit and wait for others to solve this any longer.
Any advise on where/how to begin to troubleshoot this issue would be greatly appreciated.
Thanks.
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Koen Van WielinkBusiness Intelligence SpecialistAsked:
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Barry MolenwijkTechnical Support Specialist IICommented:
Hi Koen,

Do you guys use the latest version of the Citrix Receiver, or do you still use - for example - the Online Plugin?
Also, do other applications have the same issue or is it isolated to this specific application?
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Koen Van WielinkBusiness Intelligence SpecialistAuthor Commented:
Hi Barry,

Some are using the latest version of Citrix Receiver Enterprise, and others are using the latest normal Citrix Receiver plugin downloaded from the Citrix website.
Currently this is the only application we publish through Citrix, so I don't have another frame of reference unfortunately.
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Barry MolenwijkTechnical Support Specialist IICommented:
Ah that's a shame, but we'll try to make it work with what we do have.

First off, the architecture. It's highly unusual to use a  Licensing Server and StoreFront server as the actual server on which the application runs. I would suggest you install this on a dedicated Citrix server.

When your application starts and you get either error, the administrators have to take a look at the status of the network connections (netstat) on the Citrix server with which you're trying to connect. The errors you're getting are often a sign that verification of the licensing isn't working properly due to - for example - a NIC error or network error.

What I'd suggest is to have your Administrators install the latest XenApp 7.5 and Windows Server updates, including the latest drivers for their network cards. While they're at it, they might as well look into the possibilities of upgrading to XenApp 7.6, since 7.5 is the Windows Vista of XenApp ;)

Unfortunately I don't have a straight "here you go, this fixes it" answer for you.
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Koen Van WielinkBusiness Intelligence SpecialistAuthor Commented:
Hi Barry,

Regarding this line:

First off, the architecture. It's highly unusual to use a  Licensing Server and StoreFront server as the actual server on which the application runs. I would suggest you install this on a dedicated Citrix server.

I think I wasn't very clear. We have 2 application servers, and a separate license server AND a separate storefront server. My choice of wording and punctiation wasn't the best. Sorry.

I'll accept your answer and see what we can do with it. It looks like they might want me to follow some proper Citrix administration courses so hopefully that comes off the ground and I'll be able to troubleshoot things myself. Right now I'm relying on admins who unfortunately don't know too much about how Citrix should be configured.
Thanks again for the help.
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Koen Van WielinkBusiness Intelligence SpecialistAuthor Commented:
Thanks again Barry. I wasn't expecting a straight fix for this one, the issue is way to broadly defined for that. We'll go with this for now, and see what happens.
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Barry MolenwijkTechnical Support Specialist IICommented:
Hi Koen,

No problem at all. For your Citrix training I would highly recommend CBT Nuggets (www.cbtnuggets.com) as a way to get your knowledge up to speed. Those guys are brilliant.

If you need any assistance in the future on this matter, you know where to ask the question ;)
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