Symptoms

Though Citrix Systems supports Microsoft Windows Server 2008 R2 Service Pack 1 with Citrix XenApp 6, the users of Microsoft Server 2008 R2 Service Pack1 must be aware of certain issues when using it in conjunction with this product as outlined in the Knowledge Center article CTX122601 - Microsoft Windows Server 2008 R2 - Supportability.

You cannot connect to Citrix sessions when Microsoft Windows Server 2008 R2 Service Pack 1 is present.

Trying to use the quick launch tool CTX122536 – Citrix Quick Launch to the server IP address becomes unresponsive at: “Connection established. Negotiating capabilities...”

“Qwinsta” from a command line returned no information and just left a blinking cursor.

Svchost.exe crashes in TermService

Trying to use the quick launch tool to start a published application becomes unresponsive at “Launching.”

Note: When verifying this issue against the release to manufacturing of Microsoft Windows Server 2008 R2 Service Pack 1, the reviewer was unable to install the Citrix Hotfix XA600W2K8R2X64001 on this unstable server. The windows installer seems to become unresponsive, but upon restarting the server, the hotfix is installed.

UPDATE: XA600W2K8R2X64001 has now been superseded by the Knowledge Center article CTX130473 - Hotfix Rollup Pack 1 for Citrix XenApp 6 for Microsoft Windows Server 2008 R2.

Workaround

Install Citrix Hotfix XA600W2K8R2X64077 from CTX130236 - Hotfix XA600W2K8R2X64077 - For Citrix XenApp 6.0 for Windows Server 2008 R2 - English.

More Information

When connecting to a server running Windows Server 2008 R2 with Service Pack 1, Terminal Services can exit unexpectedly. This causes the users to experience a black screen when logging on and the logon process fails to complete. [#232329]