Troubleshoot machines


Citrix Health Assistant is a tool to troubleshoot configuration issues in unregistered VDAs. The tool automates a number of health checks to identify possible root causes for VDA registration failures and issues in session launch and time zone redirection configuration. The Knowledge Center article, Citrix Health Assistant - Troubleshoot VDA Registration and Session Launch contains the Citrix Health Assistant tool download and usage instructions.

The Filters > Machines view in the Monitor tab displays the machines configured in the site. The Multi-session OS Machines tab includes the load evaluator index, which indicates the distribution of performance counters and tooltips of the session count if you hover over the link.

Click the Failure Reason column of a failed machine to get a detailed description of the failure and actions recommended to troubleshoot the failure. The failure reasons and the recommended actions for machine and connection failures are available in the Citrix Director Failure Reasons Troubleshooting Guide.

Click the machine name link to go to the Machine Details page.

The Machine Details page lists the machine details, infrastructure details, and details of the hotfixes applied on the machine.

Machine-based real-time resource utilization

The Machine Utilization panel displays graphs showing real-time utilization of CPU and memory. In addition, disk and GPU monitoring graphs are available for sites with VDA versions 7.14 or later.

Disk monitoring graphs, average IOPS, and disk latency are important performance measurements that help you monitor and troubleshoot issues related to VDA disks. The Average IOPS graph displays the average number of reads and writes to a disk. Select Disk Latency to see a graph of the delay between a request for data and its return from the disk, measured in milliseconds.

Machine details

Select GPU Utilization to see percentage utilization of the GPU, the GPU memory, and of the Encoder and the Decoder to troubleshoot GPU-related issues on Multi-session or Single session OS VDAs. The GPU Utilization graphs are available only for VDAs running 64-bit Windows with NVIDIA Tesla M60 GPUs, and running Display Driver version 369.17 or later. The VDAs must have HDX 3D Pro enabled to provide GPU acceleration. For more information, see GPU acceleration for Windows Single session OS and GPU acceleration for Windows Multi-session OS. When a VDA accesses more than one GPU, the utilization graph displays the average of the GPU metrics collected from the individual GPUs. The GPU metrics are collected for the entire VDA and not for individual processes.

Machine-based historical resource utilization

In the Machine Utilization panel, click View Historical Utilization to view the historical usage of resources on the selected machine. The utilization graphs include critical performance counters of CPU, memory, peak concurrent sessions, average IOPS, and disk latency.


The Monitoring policy setting, Enable Process Monitoring, must be set to Allowed to collect, and display data in the Top 10 Processes table on the Historic Machine Utilization page. The collection is prohibited by default.

The CPU and memory utilization, average IOPS, and disk latency data is collected by default. You can disable the collection by using the Enable Resource Monitoring policy setting.

Historical machine utilization

  1. From the Machine Utilization panel in the Machine Details view, select View Historical Utilization.
  2. In the Historical Machine Utilization page, set Time Period to view usage for the last 2 hours, 24 hours, 7 days, month, or year.


    Average IOPS and disk latency usage data are available only for the last 24 hours, month, and year ending now. Custom end time is not supported.

  3. Click Apply and select the required graphs.
  4. Hover over different sections of the graph to view more information for the selected time period.

Historical machine utilization with IOPS and disk latency

For example, if you select Last 2 hours, the baseline period is the 2 hours prior to the selected time range. View the CPU, memory, and session trend over the last 2 hours and the baseline time. If you select Last month, the baseline period is the previous month. Select to view the Average IOPS and disk latency over the last month and the baseline time.

  1. Click Export to export the resource utilization data for the selected period. For more information, see Export reports section in Monitor Deployments.
  2. Below the graphs, the table lists the top 10 processes based on CPU or memory utilization. You can sort by any of the columns, which show Application Name, User Name, Session ID, Average CPU, Peak CPU, Average Memory, and Peak Memory over the selected time range. The IOPS and Disk Latency columns cannot be sorted.


    The session ID for system processes is displayed as “0000”.

  3. To view the historical trend on the resource consumption of a particular process, drill into any of the Top 10 processes.

Machine Console access

You can access the consoles of Desktop and Multi-session OS machines hosted on XenServer Version 7.3 and later directly from Monitor. This way, you don’t require XenCenter to troubleshoot issues on XenServer hosted VDAs. For this feature to be available, the XenServer hosting the machine must be of Version 7.3 or later and must be accessible from the Monitor.

Machine console access

To troubleshoot a machine, click the Console link in the corresponding Machine Details panel. After authentication of the host credentials you provide, the machine console opens in a separate tab using noVNC, a web-based VNC client. You now have keyboard and mouse access the console.


  • This feature is not supported on Internet Explorer 11.
  • If the mouse pointer on the machine console is misaligned, see CTX230727 for steps to fix the issue.
  • Console access is launched on a new tab, ensure that your browser settings allow pop-ups.
  • For security reasons, Citrix recommends that you install SSL certificates on your browser.

Microsoft RDS license health

You can view the status of Microsoft RDS license in the Machine Details panel in the Machine Details and the User Details page for Multi-session OS machines.

Microsoft RDS License health

One of the following messages is displayed:

  • License available
  • Not configured properly (warning)
  • License error (error)
  • Incompatible VDA version (error)


The RDS license health status for machines under grace period with valid license displays a License available message in green. Renew your license before they expire.

For warning and error messages, hover over the info icon to view additional information as given in the following table.

Message Type Messages in Monitor
Error Available for VDAs version 7.16 and later.
Error New RDS connections are not allowed.
Error RDS licensing has exceeded its grace period.
Error A License Server is not configured for the required OS level with the Per Device Client Access licensing type.
Error The configured License Server is incompatible with the RDS Host OS level with the Per Device Client Access licensing type.
Warning Personal Terminal Server is not a valid RDS licensing type in a Citrix Virtual Apps and Desktops deployment.
Warning Remote Desktop for Administration is not a valid licensing type in a Citrix Virtual Apps and Desktops deployment.
Warning An RDS licensing type is not configured.
Warning The Domain Controller or License Server is unreachable with the Per User Client Access RDS licensing type.
Warning With the Per Device Client Access licensing type, the Client Device license could not be determined since the license server for the required OS level is unreachable.


This feature is applicable only for Microsoft RDS CAL (Client Access License).

PVS target device metrics

You can view the status of PVS target devices for single-session and multi-session OS machines on the Machine Details page in Director. Several metrics for Network, Boot, and Cache are available on this panel. These metrics help you monitor and troubleshoot PVS target devices to ensure that they are up and running.

PVS target device metrics


  • Network Bandwidth Utilization: Average bandwidth utilization across all NICs.

  • Server Reconnect Count: Number of times the server has reconnected due to network issues or server rebalancing or shutdowns and restarts of the Citrix Provisioning Stream Service.

  • Total UDP Retry Count: Number of times the provisioning target device has tried to reconnect to the provisioning server using UDP. This metric helps you to know if there are any network issues in the Citrix Provisioning Stream Service (for example, bad switch configurations).


  • Boot Bytes Read MB: Bytes read while booting.

  • Boot Byes Written MB: Bytes written while booting.

  • Boot From: Boot medium (vDisk, local disk, and so on).

  • Boot Retry Count: Number of retries to boot the machine.

  • Boot Time: Time taken to boot the machine, in seconds. By default, there is a 5 second delay between retries. If this delay grows into double digits, there is a significant increase in boot time. Check your provisioning configuration to resolve this issue.

  • Target Software Version: Version of the Provisioning target device software.

  • vDisk Name: vDisk from which the Provisioning target device is booting.


  • Write Cache Type: vDisk can be set to different types of cache. For more information, see Knowledge Center article CTX119469.

  • Write Cache Volume Drive Letter: Drive letter for write cache types involving drives.

  • Write Cache Volume Size MB: Total configured volume size for write cache.

  • Cache File Size MB: Current cache file size (cache on device RAM with overflow on hard disk).

  • Ram Cache Usage MB: Current RAM cache size (cache on device RAM with overflow on hard disk). Use Overflow to disk only if necessary. This metric is useful when setting or optimizing the proper size of RAM cache.

For more information, see Using the Status Tray on a target device.

Provisioning target device metrics is available only on:

  • Provisioning machines.

  • Provisioning target device version 7.19 and later.

  • VDA version 2003 and later.


Metrics for Server Reconnect Count and UDP Retry Count are available only for Provisioning target version 1912 CU2 and later.

Troubleshoot machines