The Server (Unknown) is Not Trusted for ICA Connections

The Server (Unknown) is Not Trusted for ICA Connections

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Article ID: CTX129258

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Updated On:

Description

When trying to launch applications from a published XenApp server desktop, the following error message appears:

“Unable to launch your application. Contact your help desk with the following information: Cannot connect to the Citrix XenApp server. The server (Unknown) is not trusted for ICA Connections. Connections to the (All Regions) Region are not allowed by lockdown settings. Please contact your administrator.”

NotePad Error

Environment

Caution! Using Registry Editor incorrectly can cause serious problems that might require you to reinstall your operating system. Citrix cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk. Be sure to back up the registry before you edit it.

Resolution

To enable the ICA client to launch the session, implement the following registry setting on the client server desktop. 

Caution! Refer to the Disclaimer at the end of this article before using Registry Editor.

HKEY_LOCAL_MACHINE\SOFTWARE\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions (for 32 bit OS)
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions (for 64 Bit OS)

Name: AllowConnection
Type: REG_DWORD
Value: Data: 1

Problem Cause

The following key value has been set to 0. This disables the ICA plugin from launching any sessions.
HKLM\Software\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\AllowConnection

Issue/Introduction

When trying to launch applications from a published XenApp server desktop, the error message “Unable to launch your application. Contact your help desk with the following information: Cannot connect to the Citrix XenApp server. The server (Unknown) is not trusted for ICA Connections. Connections to the (All Regions) Region are not allowed by lockdown settings. Please contact your administrator.” appears.
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