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UAG & DirectAccess: Some of my applications don’t work on DirectAccess, what should I do?

This is a very common situation which people might face when deploying Microsoft DirectAccess technology. Before going into how to work around this we need to know why the applications which work in internal network would fail to work on DirectAccess connectivity.

Let’s go through few types of applications and the reasons why they might fail to connect

Client/Server Applications

Why Citrix Presentation Server does not work from Mac OS 10 X when published through UAG, but works when published through IAG?

We will discuss various scenarios related to accessing Citrix Presentation Server (Web Interface 3.0/4.0/4.5) and Citrix XenApp (Web Interface 5.0) from Mac OS 10 X machines which are published through UAG and IAG SP2 UP3(In general IAG SP2), but not configuration. For configuration, please follow the steps described at

Details of components used in testing:

Unable to access RemoteDesktop and RemoteApp from Windows XP SP3 machine even after applying UAG UP1

By default, computers running Windows Vista and Windows XP operating systems cannot access RemoteApps and Remote Desktops published through Forefront Unified Access Gateway (UAG) 2010. However, by applying Update 1 for Microsoft UAG you can access these applications from Windows XP SP3, Windows Vista with Service Pack 1 and Windows Vista with Service Pack 2. What we found out from our initial research was that even with UP1 Windows XP SP3 machines will not be able to access these applications.

UAG: MS Firewall does not start and stays in "starting" state in nUAG Appliance

On few occassions you may encounter an issue wherein the nUAG appliance when started and joined to the domain for the first time will take long time to start and when it starts the MS Firewall service stays in "starting" state. This problem occurs mostly when user has not followed the quick start guide properly and continued with the steps one after the other. Two ways to resolve it;

#1 If you have already configured the nUAG appliance and now the MS Firewall service is not starting. 

Microsoft UAG Server 2010: Making “Sign Out" link visible in SharePoint Portal

When publishing SharePoint portal through the Microsoft UAG Server it removes the default “Sign Out” link on the SharePoint portal which is otherwise visible when accessing internally (Corporate network without going through UAG). Some people do think this as an issue but really this isn’t an issue rather a feature of UAG. UAG Portal has a “log Off” button which when used logs the user off from the main UAG portal and terminates all connections from UAG to the internal servers.

nAppliance nUAG and DirectAccess, Better Together !!

nAppliance nUAG remote access appliance platform is a next generation, high-performance application access and security solution which unifies a Web application firewall, SSL VPN, endpoint security to enable secure application access, access control and content inspection for a wide variety of line-of-business applications. Together these technologies provide mobile and remote workers with easy and flexible secure application access from a broad range of devices and locations including both managed and unmanaged PCs, mobile devices and kiosks.

Threat Management Gateway 2010 (TMG) SP1 Technical Preview !!

Microsoft released the Technical Preview of the Service Pack 1 for Threat Management Gateway.
Download link:

Why use Microsoft Unified Access Gateway (UAG) for DirectAccess?

Microsoft introduced DirectAccess technology in Windows server 2008R2 wherein we can connect directly to our corporate resources without the need of any VPN software. Particularly, DirectAccess configuration is pushed to the client machines through a set of group policies. Once these group policies have been applied on all Windows 7 domain joined machines, these machines can then connect remotely to the corporate network without dialing in to any VPN server.
Although, it sounds a great solution from the description it’s not easy to deploy though. The major requirement for DirectAccess is the IPv6 connectivity within the internal network.

Microsoft UAG Error: "URL /Filesharing/ contains an illegal path"

It seems to be a bug in UAG when you try to publish File Access and Remote Desktop Services on the same server. When you add applications in UAG and you add RDS before File Access you will see the following warning in the Web Logs of UAG. Also, when you try to access the File Access in portal from a client machine then you will see an error " URL /Filesharing/ contains an illegal path ".

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