Table of Contents
- Case
- Solution
Case #
You try to launch a Citrix Virtual App or Virtual Desktop using latest Citrix Workspace App client and connecting to any Virtual Apps and Desktops verion and you receive the following error:
Connection to “Desktop” Failed with Status (Unknown client error 0).
Solution #
There are various reasons for receiving an unknown client error 0 via the Citrix Workspace App client. The most common reasons along with their resolution steps are the following:
- Misconfigured local firewall. The local operating system firewall should be set to allow all outgoing connections to the public FQDN of Citrix Gateway on port 443. Also all Citrix Workspace App client .exe executables must be whitelisted on the firewall. All executables in local Windowws installation path “C:Program Files (x86)CitrixICA Client” should be whitelisted and then you shoul try your Citrix desktop launch again.
- In your Citrix Storefront server management console, find the “Optimal HDX Routing” configuration under the “Configure Store settings” section. Clear the “Optimal HDX Routing” check-boxes in the Gateway record having the Citrix Delivery Controllers.If you have a Storefront server cluster, ensure that you successfully propagate this configuration change to all Storefront servers and try your Citrix desktop launch again.
The above Storefront-related issue is by design, see the following Citrix KB article for more details:
https://support.citrix.com/article/CTX215781/hdx-optimal-routing-for-both-internal-and-external-gateway-access-using-one-store.
For more Citrix troubleshooting hints and tips, refer to my e-book “Citrix Virtual Apps and Desktops troubleshooting: A comprehensive guide for Citrix administrators” as well as review the separate article “Citrix Virtual Apps and Desktops troubleshooting tips”.
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Applicable Products
- XenDesktop
- XenApp
Symptoms or Error
When launching a published desktop, Receiver will error with «Unknown client error 0» or «Unknown client error 1110» when launching through NetScaler.
Solution
Allow all incoming connection in the Firewall Advance settings for the Domain profiles.
or
Create Inbound Firewall rule to allow UDP ports 1494/2598 and TCP ports 1494/2598 on the VDI.
Problem Cause
Windows 10 v1709 was released with enhanced Windows Defender security, which now controls Windows Firewall.
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You may receive an error while trying to launch your Citrix Desktop from a remote connection.
Desktop Viewer
The connection to “” failed with status (Unknown client error 0).
If you recently upgraded Citrix Receiver from version 3 to 4, there is a legacy registry key that needs to be deleted which causes this error to occur.
Delete the following registry key as it’s no longer needed.
HKEY_CURRENT_USERSoftwareCITRIXProgram Neighborhood AgentResource Cache (SZ)
*If this did not work for you, let us know by using the comment form below. If you have another solution, also let us know below.*
* Please use the comment form below. Comments are moderated.*
Citrix Storefront Issue with IE (Unknown Clienterror 0)
Hey guys, since i’ve found nothing on Google searching countless hours I’m trying my luck on reddit. 
Im quite new to the Citrix world and also a Young IT-Engineer still learning. All the infos I’m giving here could be wrong/misleading or not relevant at all (also english is not my native language so be gentle please :D) Ok lets get to the Problem now:
When im trying to start a Citrix Session on Citrix Storefront in IE11 I’m getting the Error: «The connection to {mydesktop} ( Failed with status (Unknown client error 0)» but in Firefox it works just fine.
The weird part about this is that it worked under IE11 in the beginning (a few weeks ago) but a few days after not touching the client it stopped.
What i’ve tried so far:
Reinstalling IE11
Reinstalling Citrix Receiver 4.7 with the Receiver Clean-Up Utility
Checking the Resource Cache Path in the Registry
Enabling several TCP/UDP Ports in the Windows Firewall (cant remember which sorry!) and disabling all Windows Security Features
Installing Windows Updates
Hardware and OS are:
ThinClient IGEL UD3-W10 51c
OS: Win10 IoT
All help is appreciated, and if u have any more questions go ahead!
Tradução automática
Эта статья была переведена автоматической системой перевода и не был рассмотрен людьми. Citrix обеспечивает автоматический перевод с целью расширения доступа для поддержки контента; Однако, автоматически переведенные статьи могут может содержать ошибки. Citrix не несет ответственности за несоответствия, ошибки, или повреждения, возникшие в результате использования автоматически переведенных статей.
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