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Category Archives: Enterprise Desktop

Top 40 Horizon View articles for April 2016

Here is an update for the top Horizon View articles list for April 2016. This list is ranked by the number of times a VMware Support Request was resolved by following the steps in a published Knowledge Base article.

  1. Manually deleting linked clones or stale virtual desktop entries from the View Composer database in VMware View Manager and VMware Horizon View
  2. Using Microsoft Certreq to generate signed SSL certificates in VMware Horizon View
  3. VMware View ports and network connectivity requirements
  4. Removing invalid linked clone entries automatically using the ViewDBChk tool in VMware Horizon View 5.3 and later versions
  5. Provisioning View desktops fails due to customization timeout errors
  6. Linked Clone pool creation and recomposition fails with VMware Horizon View 6.1.x and older releases
  7. Finding and removing unused replica virtual machines in the VMware Horizon View
  8. Configure security protocols for PCoIP for Horizon 6 version 6.2 and later, and Horizon Client 3.5 and later
  9. Removing a standard (replica) connection server or a security server from a cluster of connection/security servers
  10. Restart order of the View environment to clear ADLDS (ADAM) synchronization in View 4.5, 4.6, 5.0, 5.1, 5.2, 5.3, 6.0, and 6.1
  11. Recommended restart cycle of the VMware Horizon View environment
  12. Troubleshooting SSL certificate issues in VMware Horizon View 5.1 and later
  13. Manually deleting replica virtual machines in VMware Horizon View 5.x
  14. Provisioning VMware Horizon View desktops fails with error: View Composer Agent initialization error (16): Failed to activate software license
  15. Black screen when logging in to a Horizon View virtual desktop
  16. Generating a Horizon View SSL certificate request using the Microsoft Management Console (MMC) Certificates snap-in
  17. Recompute virtual disk digest tasks storm in vCenter Server
  18. Performing an end-to-end backup and restore for VMware View Manager
  19. Forcing replication between ADAM databases
  20. View Connection Server fails to replicate
  21. The View virtual machine is not accessible and the View Administration console shows the virtual machine status as Already Used
  22. Configuring USB device filters and redirecting Human Interface Devices (HIDs) in View Client
  23. Poor virtual machine application performance may be caused by processor power management settings
  24. Network adapter disappears from a Windows virtual machine
  25. Changing the log file behavior in the VMware View components
  26. Troubleshooting USB redirection problems in VMware View Manager
  27. Administration dashboard in VMware Horizon View reports the error: Server’s certificate cannot be checked
  28. Connecting to the View ADAM Database
  29. View Manager Admin console displays the error: Error during provisioning: Unexpected VC fault from View Composer (Unknown)
  30. Troubleshooting and Frequently Asked Questions for space reclamation in VMware Horizon View 5.2.x and 5.3.x
  31. Troubleshooting VMware Horizon View HTML Access
  32. VMware View SVGA driver reports newer version than the installed View Agent version
  33. Troubleshooting Agent Unreachable status in VMware Horizon View
  34. Intermittent provisioning issues and generic errors when Composer and vCenter Server are co-installed
  35. Disabling the HotAdd/HotPlug capability in ESXi 5.x and ESXi/ESX 4.x virtual machines
  36. Troubleshooting frequent PCoIP disconnects in a VMware View environment
  37. Increasing the video memory on VMware View desktops
  38. Determining which replica disk is used for a linked clone virtual machine
  39. VMware View Administrator shows the virtual machine status error: Configuration Error
  40. View Connection Server reports the error: [ws_TomcatService] STDOUT: java.lang.OutOfMemoryError: Java heap space

View Composer DiskFault: Disk customization failed due to an internal error

There’s a glitch some customers are encountering  whereby a Linked Clone desktop is created on vCenter Ok, but is deleted soon after vCenter complains about either “disposable” or “internal” .vmdk files this desktop. Creating and recomposing linked clone desktops fails on VMware Horizon View 6.1.x and all older releases after you have applied an upgrade patch.

On View Administrator, recomposing of pool fails with the error:

View Composer DiskFault: Disk customization failed due to an internal error

This issue occurs when older versions of Horizon View Composer prior to VMware Horizon 6.2 attempt to communicate with VMware ESXi hosts, but SSL v3 is disabled beginning in VMware ESXi 5.5 Update 3b and 6.0 Update 1 hosts.

We’ve created a KB article to address this scenario here: Linked Clone pool creation and recompositon fails with VMware Horizon View 6.1.x and older releases (2133018)

Note: There is a workaround provided in the KB but it is not advised to use it. The workaround makes the VMware ESXi 5.5/ 6.0 hosts vulnerable to security threats reported for SSL v3

View desktop goes into Already Used state, or Agent Disabled state

In versions 4.6 through 5.0.x View desktops can also go into the Already Used state if a virtual machine is powered on in another ESXi host in the cluster in response to an HA event, or if it was shut down without reporting to the broker that the user had logged out.

This is due to a security feature which prevents any previous session data from being available during the next log in. If a desktop that is set to refresh or delete after log off is reset, the desktop goes into the Already Used state, or possibly the Agent Disabled state.

If you run into this situation we have a KB article that covers this scenario: The View virtual machine is not accessible and the View Administration console shows the virtual machine status as “Already Used” (1000590)

PCoIP connections suddenly failing?

There is an issue which may occur when you install or upgrade your VMware Tools after having installed your View Agent. The set of VGA drivers shipped with VMware Tools might sometimes be incompatible with VMware View and PCoIP, whereas the VMware View Agent software contains a supported VGA driver.

For this reason, today we’re highlighting the KB article we have written up for this issue: Error attaching to SVGADevTap, error 4000: EscapeFailed reported by PCoIP server (1029706)

To resolve this issue, you must update the drivers to the version supplied with VMware View Agent. The KB also includes a nice table of video drivers supplied with different VMware View Agent versions and operating systems.

Dealing with issues with View Event Database

We’d like to focus today on a KB article which tries to address all the issues encountered by the users with regard to View Event Database deployment. The article includes a list of basic steps that will help you address all the issues that might be encountered during or after your deployment.

Configuring VMware View Event database on an SQL server fails with the error: An error occurred while attempting to configure the database (1029537)

Users actions are recorded about View Manager events. If this database is not configured you would need to look in the log files to gather information about events, and the logs contain very limited information.

Configuration of the event database will fail if the user has not met the prerequisites required. Our KB article helps users meet all the required prerequisites needed, from network connectivity, to SQL server, to correct credentials for database accounts, ports and firewall status.

If you find your issue persists after validating all the 12 steps mentioned in the article, then the potential cause for the issue might be an older version of the JDBC driver. Newer versions have a number of bug fixes for SSL certificate issues. Following the steps to install new version of JDBC driver should address all the issue and completes the configuration of VMware View event database successfully. Of course, if you’re unsure or still struggling, by all means contact our support team.

Basic Troubleshooting Guide for View Composer

Today we’d like to highlight one specific KB article related to View Composer. You might consider it a first step in addressing composer problems. The KB we’re talking about is:

VMware View Composer resolution guide (2104915)

This guide includes basic troubleshooting steps, issues observed in the process of composer installation or composer uninstall process, and finally operational issues. At the bottom of the KB there is a long list of related KBs that are also of interest if View composer problems are encountered.

  • Basic Troubleshooting Questions
  • Install and Uninstall VMware View Composer
  • VMware View Composer Error Messages
  • VMware View Composer Customization Failures
  • Unknown VMware View Composer Failures

Issues creating Desktops in VDI, and what to do about it

Connection Server rebootWe want to highlight some mitigation techniques and a handy KB article today for those of you managing Horizon View desktops. We’re talking about those occasions when no desktop can be created or recomposed in your vdi environment and no tasks submitted from Connection Brokers are acted upon by Virtual Center server.

Our Engineering team has been hard at work fixing many of the underlying causes of this happening and the latest release of View have all but eliminated these issues. However, if these issues show up in latest View releases, then we ask everyone to follow the specific steps in this KB: Pool settings are not saved, new pools cannot be created, and vCenter Server tasks are not processed in a Horizon View environment (2082413)

This KB contains several main steps, the first one of which is collecting the bundled logs from all connection brokers in the vdi environment and recording the time this issue was first observed. Steps 2 to 6 are basic steps that can potentially help address the issue but if issues persist, then step 7 requests opening a support case and submitting the collected bundle logs in step 1 alongside the recorded time when the issue was first observed. You might also include any other useful information, such as whether any recent changes were made to the environment.

When opening your support case, please note this KB article number in the description the case. That helps us get right on point ASAP.

Step 8 is what should address this issue without any connection broker reboot as it causes the stoppage of all View services in all View connection brokers and then restarting them.

If step 8 does not resolve your issue, then the last step (9) involves reboot of all connection serves and this has always addressed the issue in our experience.

ALERT: Linked Clone pool creation and recompose failure

VMware Support AlertBefore upgrading to vSphere 6 update 1, VMware would like everyone to read the following KB article for important information.

Creating and recomposing linked clone desktops will fail on Horizon view 6.1.x and all older releases after upgrading to vSphere 6.0 Update 1.

The Linked Clone desktop appears to be created on vCenter, but it will be deleted  soon after vCenter complains about either “disposable” or “internal” vmdk files  this desktop.

All older versions of Horizon View Composer prior to Horizon 6.2 require SSL v3 to communicate with ESXi hosts, however the SSL v3 has been disabled in ESX6i Update 1 hosts.

Please read this KB article for further information: Upgrading to vSphere 6 update 1 will cause Linked Clone pool creation and recompose failure with Horizon View 6.1.x and older releases (2133018)

Any updates to this information will be made in the KB article itself.

Disk is already managed by View

Horizon ViewToday we will highlight one of our KB articles that is getting some traction with our Horizon View customers. The  issue can occur if the ADAM database contains an invalid entry for a persistent disk.


  • Attempting to import the disk from vCenter Server fails with the error:
This disk is already managed by View
  • Cannot detach a Persistent User Data Disk in View Manager.
  • Cannot import a Persistent Disk from vCenter Server for a virtual machine that was deleted in View Administrator.
  • The Persistent disk is visible when the option to show incompatible files is selected.

If you are encountering any of these symptoms in your environment, please refer to KB article: Cannot detach a Persistent Disk in View Manager 4.5 and later (2007076). This article has a 5 star customer rating.

Note: This KB contains two Warnings. Be sure you completely understand the article, and as always check that your backups are working and are valid.

Invalid Linked Clones – revisited

Back in July we had a post about using the ViewDbChk command to remove invalid linked clone entries, which applied to Horizon View 5.3 and later. Apparently a similar situation can arise in earlier versions of the product as well, but the steps to fix it are different.

For users of View 5.2 or earlier, we have created KB article: Manually deleting linked clones or stale virtual desktop entries from the View Composer database in VMware View Manager and VMware Horizon View.

Symptoms include:

  • You cannot provision or recompose a linked clone desktop pool
  • You see the error:
Desktop Composer Fault: Virtual Machine with Input Specification already exists
  • Provisioning a linked clone desktop pool fails with the error:
Virtual machine with Input Specification already exists
  • The Connection Server shows that linked clone virtual machines are stuck in a deleting state
  • You cannot delete a pool from the View Administrator page
  • You are unable to delete linked clone virtual machines
  • When viewing a pools Inventory tab, the status of one or more virtual machines may be shown as missing

So remember, if you have 6.1 or later, you want to use KB article: Removing invalid linked clone entries automatically using the ViewDBChk tool in VMware Horizon View 5.3 and later versions (2118050)

If you have 5.2 or earlier, use: Manually deleting linked clones or stale virtual desktop entries from the View Composer database in VMware View Manager and VMware Horizon View (2015112)