Memory Issue on Windows 2008 R2

Hello Experts
I am facing an weird issue on Windows 2008 R2 Server, its a Hyper Virtual Machine.
The issue is that there is a exe application which is consuming the memory momentarily but not releasing. The usage increased up to 99%.The total memory on the server is 100 GB.

This freezes the server and we are forced to reboot the server.

I would highly appreciate any help and suggestions.
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Are you using Dynamic RAM?  Maybe disable that.  Patch the application.  If it's not supported in a virtual environment, move it to a physical environment (virtualization is great, you should use it everywhere... EXCEPT where it's not supported).

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Travis MartinezStorage EngineerCommented:
You might also try and use Process Lasso and see if it keeps the system from freezing.  I use it on several systems and it keeps them from running away.
cciedreamerAuthor Commented:
Hi Lee,
Its fixed RAM. Its .NET based application
We cannot to move the physical because it is in production.
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Shaun VermaakTechnical SpecialistCommented:
Do you have the source code?
cciedreamerAuthor Commented:
Hello Experts

Any more suggestions ? This is very frustrating issue as it is affect our production services
this is like exchange mailbox server which eats up ram as much as possible, only thing it do not hang server and release memory when design.. we can cap memory utilization for mailbox server if wanted to..
Same way check if you can cap your application memory utilization programmatically / by some coding etc.
cciedreamerAuthor Commented:
But same application is running in different production network and it is working fine
The issue just started from last two days
R@f@r P@NC3RVirtualization SpecialistCommented:
Hello cciedreamer,

Can you increase the memory capacity of the virtual server to validate if its performance improves or remains the same? This is momentarily while we look for a better solution. Do you have the capacity to increase server memory?

You indicate that the application consumes 99% of the memory, causing the server to reboot.

Please validate the event viewer to see what errors or warnings you observe.

It also checks through the operating system the Resource Monitor to validate all hardware resources, cpu, memory, disk or network and discard that there is no process that is causing slowness to the server.

Additional executes in the operating system the Performance Monitor to generate a report of all the behavior of the operating system, this in order to have a complete report and diagnose the problem.

I imagine that on the server, you run an antivirus application, as it is called? In some cases the antivirus generates slowness in the servers.

If you can take images and share them here it would be excellent to help you with your failure.

I remain attentive to your comments. Regards...
cciedreamerAuthor Commented:

This application is .net framework and dll based.
Shaun VermaakTechnical SpecialistCommented:
Do you have the source code??
cciedreamerAuthor Commented:
Sorry I dont have source code
R@f@r P@NC3RVirtualization SpecialistCommented:

How are you going with the incident that you present, something new?
cciedreamerAuthor Commented:
We moved the server to physical and its working fine
The issue was not solved with mentioned virtual server
R@f@r P@NC3RVirtualization SpecialistCommented:
Good Morning,

Ok, but before moving the server to physical, could you make one of the recommendations mentioned above, to validate if your problem was solved?

R@f@r P@NC3RVirtualization SpecialistCommented:

Could you perform the tests mentioned?

cciedreamerAuthor Commented:
We move the server to physical box
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