Have a 2008 R2 Domain Controller but 20 thin client PCs. At random times all users can login and at other times only so many can login. I have a strange feeling this could relate to licensing issues but not fully sure. How would this work ?
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Clarify - you have THIN clients logging in to the network or to the Domain Controller via RDS (you SHOULD NOT have a DC as an RDS server, but you need to clarify this).

If it's NOT an RDS server, then Client Access Licenses DO NOT play a role.  In 2008 R2 it's a paper documentation thing - there is no enforcement EXCEPT for RDS.

I would suggest you examine the logs of the DC to see what is happening.
AkinsdNetwork AdministratorCommented:
Check and make sure the clients that are unable to login are receiving addressees from the DHCP server.

If not, you may want to re-configure your DHCP lease period to 1 day (8 hours) or less so addresses are not hogged up when not active
discoveranotherAuthor Commented:
Thanks for the replies. Sorry for brief explanation. Basically what happens is there are 20 thin clients. Each set of ten clients are controlled by a 'server' with Windows 7 on but thin-client software that apparently controls them. There is also a domain controller onsite that provides access to resources etc.

So, we have a domain controller > 2 x thin-client servers > 20 clients
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discoveranotherAuthor Commented:
Each thin client picks up the Windows 7 desktop from the thin-client servers, thus, thin-client servers are  windows 7 and have thin-client software on, something called vspace, not familiar with it, and the client machines get the same virtual desktop, the domain controller provides access to resources.
discoveranotherAuthor Commented:
The domain controller does not have any thin-client software on but not sure if it should have, but how does the licensing work in this scenario ?
discoveranotherAuthor Commented:
Im confused as the way the licensing works here. Do I need a Windows VDA license ? Where is this installed to ?
Your environment is Ncomputng. Since you are not sure which model you are using i recommend you contact them. They can confirm your environment it and help configure it. You may not need the Windows VDA but CALs instead.

Lee W, MVPTechnology and Business Process AdvisorCommented:
ComputerTechie seems to think you are using NComputing - are you?  Is  there a reason you left that pretty big detail out?  I have never used that product but looked into it and one or two others like it over the years... People who use it seem to be doing so thinking they are going to get around MS licensing for RDS services.... yet while it doesn't (as I understand it) "technically" require the licenses, legally it DOES.   And if legally it does, I have not seen any advantage to using it over Microsoft RDS services.  Indeed, it's usually MORE EXPENSIVE if I remember correctly.

If ComputerTechie is correct, then I strongly suspect your issues are licensing related since Windows 7 doesn't have a "server" version and is limited to ONE simultaneous user.  The NComputing software may work around it sometimes but patching could end up fixing the holes NComputing uses to allow multiple users in which case, I could see you having problems.

It has been a while since I looked at NComputing, but I remember really not seeing the point to it considering the licensing ramifications.

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