When performing an installation of the Directory Synchronization Agent, the following error is encountered and the installation fails:
Installation failure. Failed to serialize DevExtImpl.
Error = 0x00000020
OR
Error = 0x00000005
Installing DSA on Windows Server 2012, 2016 and 2019
User Account Control is not fully disabled in the Registry.
Installing DSA on Windows Server 2008 / R2
Microsoft .NET 3.5 Service Pack 1 prerequisite has not been installed prior to the attempt to install the Directory Synchronization Agent.
For Windows Server 2012, 2016 and 2019
Disable User Account Control through the Registry by changing the DWORD "EnableLUA" from 1 to 0 and restart the server
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
For Windows Server 2008 / R2
Install Microsoft .NET 3.5 Service Pack 1 and once this has completed, ensure that a restart of the Operating System is performed before attempting to run the Directory Synchronization Agent install again.
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