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Citrix XenApp SVCHOST

SVCHOST ISSUE - 2008R2 XenApp 6

one of the SVChost.exe will randomlly appear and take 50% of the processor. (Server has two processor, so basically it is maxing out one processor) this process makes the server super slow, and eventally it will lock up the server. There are not event logs, or crash information - the server will eventally just lock completely up and we have to power it off - again nothing in the event logs.

It seems to happen more often when someone connects via RDP - but it is not everytime. And it was happened with no RDP sessions. The only fix is the power off and back on then prey it does not happen again.

If you kill the process, you immedaitly lose RDP and Citrix connections, and you cannot connect to the box or login. Existing connections stop as well.

Are first server was doing this, so we completely rebuild from scrath and still have the issue.

We have applied all of the updates based on this site, including hotfix 40. We are not running SP1 for windows.
http://forums.citrix.com/thread.jspa?threadID=282924&tstart=0

We have an open case with citrix support, and they are saying they have never seen the problem. We have even started over, rebuilding a whole new system, and still we are seeing this. Anyone else with this issue??

The next time it happens we plan to capture what exe svchost.exe is using so we know with the problem. We basically are just sitting back waiting for the problem in our production enviroment.

Very surprised citrix support has not seen this - am I the only one out there? I know that hotfix 30 addresses something regarding svchost with terminal server (but we are not getting an event log error that matches that hotfix, plus we have hotfix 40 installed which includes hotfix 30)
 

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iowasolutions
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iowasolutions
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1 Solution
 
Carl WebsterCommented:
Do you have all the Microsoft hotfixes installed?

I have found that installing 2008 R2 SP1, after installing Citrix hotfix 001, really fixed a lot of these types of errors.  Every customer I have installed SP1 at is no longer having these weird stability issues.
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Carl WebsterCommented:
This is from the readme for Citrix hotfix 001:

When connecting to a server running Windows Server 2008 R2 with Service Pack 1, Terminal Services can exit unexpectedly. This causes users to experience a black screen during logon and the logon process fails to complete.

So install Citrix hotfix 001 BEFORE you install R2 SP1.
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iowasolutionsAuthor Commented:
Thanks for your reply/

We had 001 on our first system, along with SP1 that had the issue.  In my first discussions with Citrix tech support, they told me that SP1 for 2008R2 is not supported, and it cuasing issues.  They reccomended re-build the entire system from scratch with no SP1 - and follow these updates (http://forums.citrix.com/thread.jspa?threadID=282924&tstart=0)+ hotfix 40.  

So guess we still had this issue with 001 hot fix.

The problem is random but seems to happen more often when we RDP to the box, while 20 users on on the system.    removing AV software has not made a different.

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iowasolutionsAuthor Commented:
Carl - Question - did you see this exact problem with svchost killing the CPU?
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Carl WebsterCommented:
We had all kinds of stuff killing the CPU.  Have had no issues in over a month now.
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GekoExpertCommented:
no solution?
we have the same probleme here, on both, 2 servers with SP1 and one without SP1.

Saw the error one week ago for the first time, and we did not installing any updates the last 3 weeks...
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Carl WebsterCommented:
What is running inside of svchost when the problem arises?  svchost is just a wrapper of sorts.
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GekoExpertCommented:
i don't know.
I was having enough to do with loocking the fault server, logoff sessions, answer phone calls etc ;-)

will try to check it the next time
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iowasolutionsAuthor Commented:
Our system did it again this morning after running great for an entire week.  We didn't see the problem in time the server ran intself into the ground before we could see what the svchost was using.
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Carl WebsterCommented:
And there is nothing in the application or system event logs?  Every server I have seen with this issue has always recorded something in the logs.
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iowasolutionsAuthor Commented:
Citrix never could fix this for us. I have since given up on finding a resolution and will be closing this question. Thank you for your assistance.
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iowasolutionsAuthor Commented:
Thanks for trying to help
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