When launching a virtual application/desktop using the Citrix Workspace app for HTML5, there is a silent failure to launch.

The Admin would need to navigate to Delivery group > Edit delivery group > User settings > Uncheck "Enable SecureICA"

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Problem Cause

SecureICA is not supported on the Citrix Workspace app for HTML5.

Note: SecureICA does not use FIPS-compliant algorithms. SecureICA does not perform authentication or check data integrity. 

• If SecureICA is enabled via default.ica, there is a fallback to Basic encryption and end-users will not see an impact.
• If SecureICA is enabled via the Delivery Group settings, the users will see launch failures for both virtual apps and desktops.

To confirm this is the root cause,

• you can access console logs for the Citrix Workspace app for HTML5 as per instructions at: https://support.citrix.com/article/CTX217352.In the .txt file generated, you will be able to see
  “SESSION:|:ICA:|:WINSTATION:|:DRIVER:|:terminate session5"
• Alternately, on the VDA you can see events inside System event viewer >Source "TDICA" > "ICA transport driver connection closed"
• Or on the DDC (Cloud connector in case of Citrix cloud-hosted environment) > event viewer >administrative events > Source "Schannel" > A fatal error occurred while creating a TLS client credential

Recommended alternative: If you’d like an alternative to SecureICA, we recommend you use TLS (Transport Layer Security). For more information on TLS, see https://docs.citrix.com/en-us/citrix-virtual-apps-desktops/secure/tls.html.