We use Microsoft’s AppLocker product to lock down our applications on cloud servers. This is done using the publisher feature and adding rules for DAW and our application’s code signing certs.

Until about a week ago this was worked fine. However, AppLocker is now preventing own application (.exe) from running and the Windows Event Log reports the following:

Code:
Log Name:      Microsoft-Windows-AppLocker/EXE and DLL
Source:        Microsoft-Windows-AppLocker
Date:          3/29/2019 10:34:08 AM
Event ID:      8004
Task Category: None
Level:         Error
Keywords:      
User:          OURCLOUD\AnonUser
Computer:      Applocker-test.ourcloud.com.au
Description:
D:\APPS\TRIUMPH\PROGRAMS - ISSUE\MSBOOT.EXE was prevented from running.
Unfortunately, AppLocker doesn’t indicate which rule is blocking our application. Our code signing cert. is valid and the .exes are timestamped. The cert. is by DigiCert and, as far as I can tell, their trust has not been breached or revoked.

Does anyone else use AppLocker with similar rules?