EPA failure with the following error seen in the logs:
2022-04-13 12:24:19.079 | Tid: 03344 | ERROR   | downloadEpaLib | 296 | Failed to verify downloaded EPA library
2022-04-13 12:24:19.079 | Tid: 03344 | DEBUG   | ns_verifyfile: called
2022-04-13 12:24:19.080 | Tid: 03344 | ERROR   | ns_verifyTrustedCert | 162 | WinVerifyTrust failed -2146762496, err -2146762496
2022-04-13 12:24:19.080 | Tid: 03344 | ERROR   | checkAndLoadEPALib | 518 | Failed to verify EPA DLL
2022-04-13 12:24:19.080 | Tid: 03344 | ERROR   | initEPAlib | 702 | Failed to load EPA library
2022-04-13 12:24:19.080 | Tid: 03344 | ERROR   | epaLibScan | 787 | Faield to initialize EPA library
 

This could happen because of IC (even if IC as a feature is disabled).
Create the following nocache policy and bind this to the vServer with the highest priority; this should be either the GW Vserver or AAA vserver, whichever is relevant.

add cache policy epa_nocache_pol -rule "HTTP.REQ.URL.CONTAINS(\"/win/epaPackage.exe\")" -action NOCACHE

Also you must perform the following:

• Remove any corrupted EPA package from the end-user machine (in case any present at - C:\Users\<USERNAME>\AppData\Local\Citrix\AGEE)
• Flush the ADC cache for inappropriate caching the plugin executables (which involves epaPackage.exe). Use the command to flush the content group. Even if the 'Integrated Caching" feature is disabled, this still applies:

> flush cache contentGroup loginstaticobjects

Problem Cause