[This article originally appeared in the "Closer to the Edge" blog at:
I don’t believe that Microsoft is planning on providing an official list of known DirectAccess application compatibility issues and their respective solutions or mitigation methods. Consequently, I thought it might be useful to create
a wiki article that captures known UAG DA application compatibility issues I am seeing in the forums and also from my own deployment experiences. UAG DA
sometimes has the upper hand over native DirectAccess implementations here, as the option to utilise the in-built NAT64 functionality is potentially available, but this is not always a sufficient solution as the communication between DirectAccess clients
and UAG will always take place over IPv6.
Tom Shinder has a great article on the subject of DirectAccess Application Compatibility which I am going to reference as a good primer for this subject; it can be found
here. The TechNet information available
here is also useful background reading.
Note: Although this article was originally written for UAG DirectAccess it is also applicable to Windows Server 2012 DirectAccess.
UAG DirectAccess Application Compatibility Table
Application or Product Name
Known Solution or Mitigation Techniques
Office Communication Server
2007 and 2007R2
OCS client does not support IPv6
NAT64 not possible.
Deploy an OCS Edge solution and define NRPT exemption rules for OCS related host names to use the Internet facing OCS Edge solution. More info
5.x and below
Citrix client does not support IPv6.
NAT64 to Citrix servers is not possible.
Deploy an internal Citrix Secure Gateway (CSG) solution or define NRPT exemption rules to use an Internet facing CSG solution. More info
Product does not support IPv6.
Host application using RDS RemoteApp, Citrix XenApp or use an SSTP/VPN fall-back method. More info
Support for IPv6 is not enabled by default.
Add a client system environment variable of
To be able to do load balancing you will also need to install SAPRouter. More info
Add the TCP_EnableIPv6=1 line to the [notes] section of the
More info here.
Unable to resolve hostname errors when trying to open virtual machine consoles.
This has been fixed in vSphere client version 5.0 update 1 and later.
Please feel free to keep this wiki article updated at regular intervals to try and keep the information as up to date and dynamic as possible. This should then provide a reference location that people can refer back to when thinking
about potential application compatibility issues, or when new solutions are found.
So, if you have problems with application compatibility when using UAG DirectAccess, then add them here!
Please provide as much information as possible, ideally including the following minimum information:
Community input would be of great value here, so
please do provide feedback where possible! Additional comments and corrections to keep the table as accurate as possible, are also welcome…
This article was originally written by:
Jason Jones, Forefront MVP
Principal Security Consultant
My Forefront Edge Blog: http://blog.msedge.org.uk/
My ISA Server Blog: http://blog.msfirewall.org.uk/
MVP Profile: https://mvp.support.microsoft.com/profile/Jason.Jones