Citrix Terminal Freezes after Presentation 4.5 and Symantec Antivirus Upgrade

Posted on 2007-08-02
Last Modified: 2010-03-25
We have upgraded our Citrix Farm from PS 4.0 to PS 4.5.  During this time we also upgraded our Symantec Antivirus Corporate Edition from 8 to  Many users would experience blue screens such as when Active Desktop is enabled and no icons are visible.  After a couple of minutes or so the screen would return.  After rolling back to Symantec 8.0 we noticed the problems were gone.  However there were no event log errors, Process Monitor indicators, etc indicating this was an issue.  However since the AV was one of the components that changed we proceeded with rolling back which was the logical solution.  
A new issue we are experiencing is that users terminals freeze and it only appears to happen with this type: WYSE Model No. WT3235LE.  The user then needs to restart their terminal and begin to work again.  My questions are the following:

1. Is there a known issue with newer versions and Symantec Corporate Edition Antivirus?  Symantec claims is the most stable version for Citrix.  However, I would like to make sure before proceeding.
2. Is there also a known issue with these type of WYSE Terminals indicated above?  

Thanks in advance!
Question by:jduran04
    LVL 19

    Accepted Solution

    Remove tamper protection from SAV; that causes some odd issues on Citrix/TS systems.  
    LVL 2

    Expert Comment

    The only comment that i can do in this moment is, in a Citrix environment, the real protection must be disable , and a scheduled scan need to be set every night.
    This is the best practice , the user don't make files transactions to need the real-time protection enable and this can be reduce the performance so much (imagine once symantec process for every user logged on the same machine!!)
    LVL 19

    Expert Comment

    If the users are browsing the web or using email I would worry about having no real time scanning.  As you probably know, real time scanning will look at all files as they are opened.  This can be a performance issue but if your users are doing risky things like surfing the web or using unfiltered email you must weight the overhead against the threat of virus infection not getting caught until the nightly scan.  I live with the overhead and spec my servers out accordingly.  
    Tamper protection is the only issue I have had with v10.0 and 10.1 of SAV Corp.  

    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    NetScaler Deployment Guides and Resources

    Citrix NetScaler is certified to support many of the most commonly deployed enterprise applications. Deployment guides provide in-depth recommendations on configuring NetScaler to meet specific application requirements.

    Citrix XenApp, Internet Explorer 11 set to Enterprise Mode and using central hosted sites.xml file.
    Citrix XenDesktop 7.6 Citrix Policies Disable Peripherals
    How to install and configure Citrix XenApp 6.5 - Part 1. In this video tutorial we have explained step by step installation of Citrix XenApp 6.5 Server on Windows Server 2008 R2 is explained in this video. We have explained the difference between…
    Internet Business Fax to Email Made Easy - With eFax Corporate (, you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, fr…

    761 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    7 Experts available now in Live!

    Get 1:1 Help Now