KB44255 - After upgrading Pulse Connect Secure and Pulse Policy Secure 9.1R2, client application fail to launch via Internet Explorer.

After upgrading Pulse Connect Secure and Pulse Policy Secure to 9.1R2, client applications. such as Pulse Secure Terminal Service client, Host Checker, etc., fails to launch properly with Internet Explorer.

This issue occurs under the following conditions :

• PCS / PPS was upgraded to 9.1R2
• End user is using Internet Explorer to launch client components (i.e Standalone Host Checker, Terminal Services, WSAM, JSAM, Network Connect, Pulse Desktop Client, etc.)

This issue does not affect the following:

• PCS / PPS 9.1R1 and below
• macOS endpoints are not impacted
• Windows end users using non-Internet Explorer browser (i.e. Chrome, Firefox, etc)

This issue occurs due to a failure in the signature check of any Pulse Secure client component when launched via Internet Explorer.  In the debug log, the following message will occur:

Not signed by trusted entity  

unsigned application [C:\Users\.\AppData\Roaming\Pulse Secure\Setup Client\PulseSetupClient.exe] 
detected.  

DSInvokeSetupClient - 'DSInvokeSetupClient::invokeSetupClient()' ERROR: launchSetupClient() failed

The fix is tentative for 9.1R3 (end of October).

Workaround:

• Use an alternate browser such as Chrome or Firefox.
• Rollback and upgrade to 9.1R1.