NetScaler VPX Frequently Asked Questions

Q: What is NetScaler VPX?

A: NetScaler VPX is a virtual NetScaler appliance that can be hosted on a hypervisor installed on industry standard servers.

Q: Does NetScaler VPX include all the Web application optimization functionality as NetScaler appliances?

A: Yes. NetScaler VPX includes all NetScaler load balancing/traffic management, application acceleration, application security (including NetScaler Gateway and Citrix Application Firewall), and offload functionality. For a complete overview of NetScaler feature/functionality, see http:www.citrix.com/netscaler.

Q: Are there any limitations with Citrix Application Firewall when using it on NetScaler VPX?

A: Citrix Application Firewall on NetScaler VPX provides the same security protections as it does on NetScaler appliances. Performance/throughput of Citrix Application Firewall varies by platform.

Q: Are there any differences between NetScaler Gateway on NetScaler VPX and NetScaler Gateway on NetScaler appliances?

A: Functionally, they are identical. NetScaler Gateway on NetScaler VPX supports all the NetScaler Gateway features available in NetScaler software release 9.1. However, because NetScaler appliances provide dedicated SSL acceleration hardware, they offer greater SSL VPN scalability than a NetScaler VPX instance.

Q: Other than the obvious difference of being able to run on a hypervisor, how does NetScaler VPX differ from NetScaler physical appliances?

A: There are two main areas where customers see differences in behavior. The first is NetScaler VPX cannot offer the same performance as many NetScaler appliances. The second is that while NetScaler appliances incorporate its own L2 networking functionality, NetScaler VPX relies upon the hypervisor for its L2 networking services. Generally this does not limit how the NetScaler VPX can be deployed, but certain L2 functionality that is configured on a physical NetScaler appliance must be configured on the underlying hypervisor.

Q: How does NetScaler VPX play a role in Application Delivery Market?

A: NetScaler VPX changes the game in the application delivery market in three ways:

  • By making NetScaler appliance even more affordable, NetScaler VPX enables any IT organization to deploy a NetScaler appliance not just for their most mission-critical Web applications, but for all of their Web applications.
  • NetScaler VPX allows customers to further converge networking and virtualization within their datacenters. NetScaler VPX can not only be used to optimize Web applications hosted on virtualized servers, it enables Web application delivery itself to become a virtualized service that can be easily and rapidly deployed anywhere. In lets IT organizations use their standard datacenter processes for tasks such as provisioning, automation and charge–‐back for the Web application delivery infrastructure.
  • NetScaler VPX opens up new deployment architectures that are not practical if only physical appliances are used. NetScaler VPX and NetScaler MPX appliances can be used basis, tailored to the individual needs of each respective application to handle processor-intensive actions such as compression and application firewall inspection. At the datacenter edge, NetScaler MPX appliances handle high-volume network-wide tasks such as initial traffic distribution, SSL encryption/decryption, denial of service (DoS) attack prevention, and global load balancing. Pairing high-performance NetScaler MPX appliances with easy-to-deploy NetScaler VPX virtual appliance brings unparalleled flexibility and customization capabilities to modern, large-scale, datacenter environments while also reducing overall datacenter costs.

Q: How does NetScaler VPX fit into our Citrix Delivery Center strategy?

A: With the availability of NetScaler VPX, the entire Citrix Delivery Center offering is available as a virtualized offering. Now, the entire Citrix Delivery Center benefits from the powerful management, provisioning, monitoring, and reporting capabilities available in Citrix XenCenter, and can be deployed rapidly into almost any environment, and managed centrally from anywhere. With one integrated, virtualized application delivery infrastructure, organizations can deliver desktops, client/server applications, and Web applications.

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Provisioning Servers (PVS) entering licensing grace period after a license file change

Provisioning Servers (PVS) entering licensing grace period after a license file change

  • After adding or swapping out new license files on the Citrix License Server, the Citrix Provisioning Services (PVS) deployment is in an unlicensed state or licensing grace period state.

Provisioning Server (PVS) license increments missing from recently allocated and download license files

  • On Dec 3, 2019 Citrix modified the specific license increments included in Citrix Virtual App and Desktop (CVAD) license files downloaded from the licensing center on Citrix.com. The goal of this change was to simplify the license delivery to customers and reduce the overall number of license files a customer needs to manage. The result of the licensing change (which occurred in the Citrix back office licensing systems) was the removal of legacy product licenses (such as StorageLink) and the removal of redundant or unnecessary PVS license increments in CVA and CVAD license files. The intent was clean-up oriented, there was no targeted change in customer entitlement to use PVS with their CVAD solution.
  • Standard licenses allocated between 12/3/2019 and 01/10/2020 may have been missing the PVSD_STD_CCS INCREMENT line. That was re-added 01/10/2020. Customers can return and allocate licenses to fix unlicensed PVS servers. Standard customers allocating after 1/10/2020 are not affected.
  • Customers who allocate and download CVAD license files after Dec 3 will see these changes reflected in their license files. If a customer was to compare a CVAD license file from before the change to one after the change they will notice the following license increments have been removed. Below is an example of how a Citrix Virtual Apps and Desktop customer’s license files were changed:

Sample: Citrix Virtual Apps & Desktops Premium – Concurrent


#License files allocated before Dec 3, 2019 include these license increments in a single file allocation and download:

INCREMENT XDT_PLT_CCS


INCREMENT MPS_PLT_CCU

INCREMENT XDS_PLT_CCS

INCREMENT CEHV_ENT_CCS

INCREMENT PVSD_STD_CCS

INCREMENT CESEP_ENT_CCU

INCREMENT PVS_STD_CCS


#License files allocated after Dec 3, 2019 include only a single increment

INCREMENT XDT_PLT_CCS

#These were removed in the change

INCREMENT MPS_PLT_CCU #additional Citrix Virtual Apps licenses for legacy support, removed

INCREMENT CEHV_ENT_CCS #deprecated StorageLink licenses, product end of life

INCREMENT CESEP_ENT_CCU #deprecated EdgeSight licenses, product end of life

INCREMENT PVSD_STD_CCS #PVS stand-alone datacenter licenses, removed as redundant

INCREMENT PVS_STD_CCS #PVS stand-alone desktop licenses, removed as redundant

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Citrix App Layering – Error while trying to import layers

While trying to import layers, App Layering console displays an error: “An unexpected exception occurred. If this problem continues, contact Technical Support and provide them with the details of this exception”.

User-added image

Looking at the ELM Web logs, we might see the below errors:

ERROR [2832] HandlerHelper: Unhandled System Error while processing ‘Query’ ‘ImportableRevisionsQuery’

System.Threading.ThreadAbortException

at <0x00000 + 0x00000> <unknown method>

at (wrapper remoting-invoke) Unidesk.Ma.Core.Contract.IMaFileShareBaseService:QueryPortableVersionDetails (Unidesk.Ma.Core.Contract.Queries.PortableRevisionDetailsQuery)

at MaFileShareService.QueryPortableVersionDetails (Unidesk.Ma.Core.Contract.Queries.PortableRevisionDetailsQuery ) [0x00006] in <c95541a62bf14d94b006de7142aab25b>:0

2020-02-16 07:02:26,689 ERROR [2832] HandlerHelper: Title: System Error Message: An unexpected system error occurred. Retry the operation or contact technical support. Details: Exception Message: ThreadAbortException Exception Details:

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Citrix Cloud customers experiencing issues through error code: “INET_E_RESOURCE_NOT_FOUND”.

Solution#1: Firefox Web Browser

Using DNS over HTTPS function should resolve the issue. To do this please follow these steps:

Manually Enabling DNS-over-HTTPS

You can enable or disable DNS Over Https (DoH) in your Firefox connection settings:

1. In the Firefox menu, select ‘Preferences’.

2. In the General panel, scroll down to ‘Network Settings’ and click the ‘Settings…’ button.


3. In the dialog box that opens, scroll down and select the ‘Enable DNS over HTTPS’ checkbox.


4. Click ‘OK’ to save your changes and close the window.

5. Please re-try to access Citrix services and the issue should be resolved.


For more information of enable “DNS over HTTPS” in Firefox, please refer to Firefox KB:

https://support.mozilla.org/en-US/kb/firefox-dns-over-https

For other browsers, in a search browser, please search corresponding “DNS over HTTPS” settings of the browser.

If you applied above workaround but still encounter issues (e.g. no response after clicking the applications or desktops in the workspace page), you may try to use a 3rd party solution of system level DNS over HTTPS, like Cloudflare.

Cloudflare is an OS system level DoH solution that can address all browser issues (not solely Firefox).

Please refer to https://developers.cloudflare.com/1.1.1.1/dns-over-https/cloudflared-proxy/ for Cloudflare DoH solution.

Solution#2: Using Mobile Phone’s Hotspot

As the root cause is that ISPs in a certain country cannot correctly resolve DNS names of cloud.com, users roaming to that country may encounter problems to access cloud.com in web, Citrix Workspace Application (CWA) and Citrix Endpoint Management (CEM). Using mobile of “non-local service provider” is not affected. Users can use their mobile phones (non-local service provider) as a Hotspot for their computers. Doing this will allow users to access CWA and CEM.

To do this, turn on Hotspot on the mobile phones settings and access the phone through the computer’s Wi-Fi.

The user can also use their mobile phone (non-local service provider) to access CWA and CEM.

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Support Process for DVD Burning related issues

Network latency and bandwidth can affect user experience and USB device operation when using generic USB redirection for some types of USB devices. Operations that are highly data driven such as for archival devices can be problematic due to multiple factors that lay outside the realm of user configurable settings within Citrix software.

USB Redirection DVD Burning is one of them and relies heavily on a number of things including but limited to:

  • Buffer size
  • Network Latency
  • Write Speed of the device
  • Thin-Client hardware limitations
  • Drivers from the device vendors themselves

Because Citrix cannot modify these limitations we cannot guarantee its functionality past CD Rom functionality. If the DVD Rom is redirected, visible within the OS and can be read and booted from, it is considered to be functioning as expected.

The use of the manufacture driver may be required for further functionality and will need to be explored through the specific manufacture of the DVD Rom itself.

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