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Running Two Versions of Citrix Presentation Server in Same Domain

Medium Priority
Last Modified: 2013-11-11
Hi.. We currently have 5 Citrix Servers running Presentation Server 4 in our Domain in a single farm. All servers and our domain controllers are W2K3. I want to upgrade all our Citrix Servers this year to 2008 and also upgrade to XenApp 5.0, but firstly I would just like to create a test VM with 2008 and XenApp 5 installed, install required applications on server, and get certain users from around the country to test the applications for a while. I have a few questions regarding this:
1) Do I need, or is it best to create this Citrix server in a separate test Farm;
2) If it's a separate Farm do I need another License server? If so can I use the test Citrix VM as the license server?
3) Will GPO's from our W2k3 domain controller still apply to the W2k8 Citrix server?
4) Any other implications I should be concerned about or need to know?
Thanks in advance for any advise.
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Citrix Technology Professional - Fellow
Most Valuable Expert 2019
Top Expert 2010
First, you need to read this: http://support.citrix.com/article/CTX117913

1.  "Adding a XenApp 5 for Windows Server 2008 member server to a Presentation Server 4.0 farm, a Presentation Server 4.5 farm, or a XenApp 5 for Windows Server 2003 farm, regardless of zone designation, places the server farm into mixed mode. For example, if a pilot zone is used for pre-production testing and a new XenApp 5 for Windows Server 2008 server is introduced, the server farm is now running in mixed mode. Mixed mode based on a combination of Presentation Server 4.0, Presentation Server 4.5, and XenApp 5 is supported but should be used for the shortest reasonable period of time as administration differs and may be confusing, and unexpected issues may arise."

"Testing within a production environment is not recommended by Citrix and may lead to functionality issues that affect users. A small-scale test farm that is segregated from the production farm is recommended and should be permanently designated for ongoing testing."

2.  Multiple Farms can use the same License server but I would recommend using your test VM as the license server for your 2008 licenses.

3.  Not if you put your test 08 server in a separate OU and Block Inheritance.

4.  See the above document.

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thanks for the info.. it is very helpful. With regards to terminal services licensing, do you know if we will require new TS CALS for 2008, or can we use our 2003 TS CALS?
Carl WebsterCitrix Technology Professional - Fellow
Most Valuable Expert 2019
Top Expert 2010

TS 2008 requires new CALs.  Here is an answer to probably a similar question:

Question:  Im trying to find a document that shows / explains if you can or cannot transfer your windows 2003 TS CALS to a 2008 TS environment. From I see on msterminalservices.org there is a doc explaining the differences that 2008 offers in TS. But I cannot find a doc stating if you can transfer them or not.

Answer:  By transfer, maybe you mean you want to maintain a mixed environment and have 2003 terminal servers in your environment?  You can do that, and you can also move the CALs to a 2008 License server.  Get in touch with the Clearinghouse for that.   http://technet.microsoft.com/en-us/library/cc776876.aspx

If you mean that you want to use your 2003 TS CALs to access 2008 terminal servers, that is not going to work.  You would need 2008 TS CALs for that.  Maybe you have Software Assurance?  If so then you are good to go:
http://www.microsoft.com/windowsserver2008/en/us/licensing-faq.aspx (This FAQ Answers a lot of good licensing questions):

Terminal Services (TS)
Q.  I have valid upgrade rights (Enterprise Agreement or Software Assurance) for my TS CALs. How do I exercise my upgrade rights?  
A.   You simply input the information when prompted when requesting Windows Server 2008 Terminal Services CALs using the Terminal Server Licensing tool. The information is validated and TS CAL tokens are issued.

If not, then I would talk to your Microsoft software vendor and upgrade to 2008 TS CALs.


once again, thanks for the information this is very useful. I have one more question.. not sure if I need to create a new post for it though... I want to lock down the 2008 TS, but I don't think our current group polices (which are aimed at server 2003) will fully work on a 2008 server. Are there server 2008 adm templates or something that I can install on our 2003 domain controller / AD machine?
Carl WebsterCitrix Technology Professional - Fellow
Most Valuable Expert 2019
Top Expert 2010

For that you would have to use a Vista PC to edit and modify the Group Policies.


sorry I don't understand what you mean?
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