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KB40156 - WSAM / Pulse SAM fails to install/ launch on Windows 7 with error "An unexpected error occurred" or "Windows requires a digitally signed driver"

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Last Modified Date1/24/2017 5:21 PM
Synopsis
This article describes possible reasons that WSAM (8.2+) & Pulse SAM (5.2+) fail to install/ launch on Windows 7 with error " An unexpected error occurred" or "Windows requires a digitally signed driver" on some Windows 7 machines.
Problem or Goal
WSAM (8.2+) & Pulse SAM (5.2+) fail to install/ launch, the following error message will be observed:

User-added image

The users's log file(s) will also contain the following message:
“The Juniper Networks TDI Filter Driver (NEOFLTR_XXX_XXX) service failed to start due to the following error: 
Windows cannot verify the digital signature for this file. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source.”

When attempting to launch WSAM, or any of the other clients, an error message may also appear regarding an unsigned driver. The verbiage may vary; but will contain a message stating "Windows requires a digitally signed driver".

Another visual example is:

User-added image
Cause
The standalone WSAM client version 8.2r1.1 and later, and the Pulse-integrated SAM client version 5.2r1.1 and later are code-signed with Secure Hash Algorithm (SHA) 2 certificates. This change was made in order to meet the new restrictions enforced by Microsoft Operating System(s) in 2016.  This new code-signing feature causes certain incompatibilities with older versions of Windows 7.

Specifically, versions of Windows 7 that have not been patched since March 10, 2015 will not be able to load certain drivers and executable(s) signed with SHA-2.  
Solution
Update the Windows 7 Operating System to include the March 10, 2015 patch that allows for the loading of SHA-2-signed binaries and drivers.
Related Links
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Created ByAbigail Glasco

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