Citrix Receiver 1911

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How to Log into CCCASPER
- CCCASPER Log in Instructions PDF

Citrix Workspace app for Windows is easy-to-install software that provides access to your applications and desktops using Citrix Virtual Apps and Desktops from a remote client device. Citrix Workspace app provides access from your desktop, Start menu, Citrix Workspace user interface, or web browsers.

  1. Today, I am going to show you how to install Citrix Workspace App at Microsoft Windows 10. Login to Windows 10. Login and download Citrix Workspace app 1911 from website. Double-click CitrixWorkspaceApp.exe. Click Yes at User Account Control. At the Welcome page, click Start. At License Agreement page, select I accept the license.
  2. Updated my citrix workspace to 1911, now citrix windows will only appear if I unplug all my monitors and just use the laptop screen. Any Advice besides un-installing Citrix Workspace 1911? Mar 4, 2020. #1.

Citrix Client Downloads
Current tested versions
- Windows 10 / Windows 8 / Windows 7 - Citrix Workspace App 1911
- Windows Citrix Installation Instructions PDF
- Mac OS 10.13, 10.14 and 10.15 – Citrix Workspace App 1912
- Mac OS X Citrix Client Installation Instructions PDF

Please do not download clients directly from as the newer clients may not be supported on CCCASPER. The CC does not provide support for personally owned equipment (POE).

Older Citrix Client Downloads
Note: Use these only if directed by CC User Support
- Windows 10 / Windows 8 / Windows 7 - Citrix Receiver 4.9
- Mac OS 10.11 and 10.12 – Citrix Receiver 12.7

PIV Card Intructions
CCCasper requires the use of PIV cards for on-site or remote access. If you forgot your PIV card or are having difficulty using your PIV card for login, contact the CC Service Center at 301-496-8400 or visit

Important Notes
*** If you cannot load CRIS from CCCASPER on a Mac: ***
1. Update the Citrix client using the link above.
2. Rename the computer to 15 characters or less with no spaces or special characters.
3. Call CRIS support at 301-496-8400 to have the new computer name registered.

Supported Platforms
Browsers Windows 10,7 Mac OS X
(10.13 or later)
Internet Explorer YesNo
Google ChromeYesYes

Network Requirements
For best performance always connect directly to your network via a network cable. Wireless and wireless broadband will work but may lose connectivity.

NIH CC users should contact the CC Service Desk at 301-496-8400
NIH Institute users should contact their Institute Help Desk or the NIH IT Service Desk at 301-496-HELP (301-496-4357)
If you need a temporary PIV exemption then CC Service Desk at 301-496-8400

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Symptoms or Error

Different types of networks may have different MTU/MSS requirements, which may result on packets being fragmented when transmitted on those networks. This can cause issues with applications that use UDP as transport protocol due to improper handling of UDP packet fragmentation. In the case of Citrix XenApp and XenDesktop / Virtual Apps and Desktops, this affects EDT since it is a UDP-based protocol. These issues can result on performance issues in ICA sessions, on EDT connections failing and falling back to TCP, or even not being able to establish a session altogether.
This is common when using VPN solutions like Cisco AnyConnect, when using Citrix Gateway hosted on Azure, when connected to certain Wi-Fi networks or mobile networks (3G, 4G, etc).
XenApp and XenDesktop 7.15 or Citrix Virtual Apps and Desktops 1808+
EDT-capable Citrix Receiver / Workspace app:
  • Receiver for Windows 4.9, Workspace app for Windows 1808+
  • Workspace app for Mac 1808+
  • Workspace app for Linux 1808+
  • Workspace app for iOS 1808+
  • Workspace app for Android 1909+


Citrix Virtual Apps and Desktops 7 1912 LTSR and Workspace app for Windows 1911 introduced support for EDT MTU Discovery

Citrix Receiver 1911 Pro

. If using these versions (or newer) of the VDA and Workspace app for Windows, this workaround is not required. Please review the documentation for more details.
This workaround is needed if using VDA 1909 (or older), Workspace app for Windows 1910 (or older), or Workspace app for Mac, Linux, or iOS.
The workaround involves lowering the EDT MTU to a value that will not cause fragmentation.
This MTU value needs to be determined for each network. A tool like mturoute.exe can help determine the appropriate MTU for a network.
When using Azure:
  • If ICA traffic has to traverse an Azure Gateway, the EDT MTU must be set to 1350 since Azure limits the MTU on the Azure Gateway to 1400.
  • If using an Azure-hosted Citrix Gateway, the EDT MTU must be set to a value lower than 1500 (e.g. 1480).

1. Define the EDT MTU and Output Buffers Length in the ICA file template in the Storefront server:
Open the default.ica file for editing (by default it is located in C:inetpubwwwrootCitrix<StoreName>App_Datadefault.ica)
Add the following options under the [Application] section:
udtMSS=1480 (add this line if using Receiver for Windows 4.9 - 4.9 CU3, Workspace app for Linux 1808 - 1903, Workspace app 1808+ for Mac or iOS)
edtMSS=1480 (add this line if using Receiver for Windows 4.9 CU4+, Workspace app for Windows 1808+, Workspace app for Linux 1906+)
CitrixCitrix Receiver 1911
If unsure whether to use 'udtMSS' or 'edtMSS', add both. The client will use the appropriate setting and ignore the one that does not apply.
edtMSS and OutBufLength should be set to the same value.
1480 was used as an example. Replace 1480 with the value that's appropriate for your network.
The client and server will agree on sizes during the connection negotiation.


Citrix Receiver 1911 For Sale

Citrix Receiver 1911Enable Receiver/Workspace app to read the custom EDT MTU and Output Buffers Length values.

Citrix Workspace 19.11


Citrix Receiver App 1911

If using Receiver for Windows 4.9 CU4+, Workspace app for Windows 1808+, or Workspace app for Mac 1809+, the configuration described below is NOT required, so step 2 can be omitted.
Create UDPStackParameters registry key, which is missing by default:
HKCUSOFTWARECitrixICA ClientEngineConfigurationAdvancedModulesUDPUDPStackParameters
There is a legacy issue in these Receivers for Windows where OutbufLength, when passed in an ICA file, is ignored.
Even if the registry value is modified to '*', meaning accept everything from the ICA file, the ICA file setting is still ignored.
For this to work, in addition to creating the 'UDPStackParameters' key as mentioned above, it is also necessary to modify the OutbufLength value in the registry and set it to the desired value determined above (1480 in the example):
  • 64-bit Windows
HKLMSOFTWAREWow6432NodeCitrixICA ClientEngineConfigurationAdvancedModulesTCP/IPOutbufLength
  • 32-bit Windows
HKLMSOFTWARE CitrixICA ClientEngineConfigurationAdvancedModulesTCP/IPOutbufLength
Modify the appropriate App Property to allow Receiver to read the customer parameters in the ICA file. This property is set to NO by default.
To do this, open Terminal and run:
defaults write com.citrix.receiver.nomas UDPStackParameters -bool YES
Toggle the the 'Read EDT stack parameter' option, which is disabled by default:
Settings > Advanced > Adaptive Transport Settings > Read EDT stack parameter
Enable the 'EDT Stack Parameters' option, which is disabled by default:
Settings > Advanced > EDT Stack Parameters

Problem Cause

MTU alteration not accounted dynamically by EDT, and IP Fragmentation not handled properly by network appliances.

Additional Resources