Hi, We have WPF application that use imperasation to access resources. If we publish this application on Citrix FR2 on Windows 2003 server, it works fine. If same applicaiton is published on XenApp6 on Windows 2008 R2 server, it throw exception while accesing resource on behalf of the impersonated user. User which we are impersonating is Admin on Windows 2008 R2 server. User who is accessing application from Citrix Client does not have any access on Windows 2008 R2. If we add user to Admin group on windows 2008 R2 server than application start working for that user (although we are not in favour of adding all Citrix client user to Admin group) Has anyone faced this issue? Is this "Citrix XenApp6" or "Windows 2008 R2" problem? Rakesh Patel

Check that with your application developer Technical Support. I don't see a problem with your Windows. This posting is provided "AS IS" with no warranties or guarantees , and confers no rights. Microsoft Student Partner Microsoft Certified Professional Microsoft Certified Systems Administrator: Security Microsoft Certified Systems Engineer: Security Microsoft Certified Technology Specialist: Windows Server 2008 Active Directory, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Network Infrastructure, Configuration