Best practice for licence server for RDS Farm & Certificate errors

Hello,
I am in the process of creating an RDS farm using Server 2008 R2.  I have three Session Hosts and a Connection Broker.
I have a set of 10 user CALs available and also another 20 on our current RDS server which will need migrating once we go live with the farm.
I understand the User CALs need to be installed on another Server 2008 R2 and I am wondering what is best practice.  We are running on an entirely virtual environment and it would be simple enough to create another server and install the CALs on there. 
The only issue with that is that I would need to create a replica of this new machine for DR purposes, but this would take up valuable space which may not be necessary.
We are planning on creating replicas of one of the Session hosts and the broker for DR, so I am guessing I would need to install some CALs on the Session Host which is going to be replicated.
There are a few options and I am just wondering what is the best way to go about things.
Also, as an aside, I am getting an annoying certificate error each time I log a test user onto the RDS farm - I think this is because I am using the DNS alias of the RDS Farm to log on. Is there an easy way to get around this, other than the 'Do not show
this message again'. I have been doing some research and the world of Certificates is very confusing!!
Thanks,
Caroline
C.Rafferty

Hi Caroline,
Firstly for your License related issue, you can perform the step on any VM or can create the new VM as replica for RDSH server also. But please be sure that you have installed RD License server on it, activate it and then install RDS CAL on it. But be safe
if possible don’t install RD License server with RDCB, please make that out of it as little away. As you can also install RD License server with AD or make replica of that and install RDL on that.
Best practices for setting up Remote Desktop Licensing (Terminal Server Licensing) across Active Directory Domains/Forests or Workgroup
http://support.microsoft.com/kb/2473823
What’s the specified certificate error which you are receiving?
If you're going to allow users to connect externally and they will not be part of your domain, you would need to deploy certificates from a public CA. In meantime you can refer blog for getting insight for certificate case.
Certificate Requirements for Windows 2008 R2 and Windows 2012 Remote Desktop Services
http://blogs.technet.com/b/askperf/archive/2014/01/24/certificate-requirements-for-windows-2008-r2-and-windows-2012-remote-desktop-services.aspx
Hope it helps!
Thanks.
Dharmesh Solanki
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