0x84BC0641 error in SQL SP3 installation

Question

I'm getting an error while installing SQL SP3 pack(Admin Mode) on Windows Server 2008 R2. Can someone provide the root cause of this error?

using Silent installation START /WAIT C:\Temp\SQLSP3.exe /QUIET /IACCEPTSQLSERVERLICENSETERMS /ACTION=PATCH /ALLINSTANCES

Answer 1

Following resolves this error code

Framework 4 no longer uses caspol.exe per running the command line:

C:\Windows\Microsoft.NET\Framework64\v2.0.50727>caspol.exe -all -reset

Microsoft (R) .NET Framework CasPol 2.0.50727.5420 Copyright (c) Microsoft Corporation. All rights reserved.

ERROR: Runtime error: This method explicitly uses CAS policy, which has been obs oleted by the .NET Framework. In order to enable CAS policy for compatibility re asons, please use the NetFx40_LegacySecurityPolicy configuration switch. Please see http://go.microsoft.com/fwlink/?LinkID=155570 for more information.

Now I extracted the executable and the configuration file used for the setup seems to indicate that it is using the legacy flags indicated in the CAS link.

I ran the exact same command line on the 32 bit folder

C:\Windows\Microsoft.NET\Framework\v2.0.50727>caspol.exe -all -reset

And it successfully created security.config and security.config.cch in C:\Windows\Microsoft.NET\Framework\v2.0.50727\config

Run the same command in Framework64 to generate security.config and security.comfig.cch files : C:\Windows\Microsoft.NET\Framework64\v2.0.50727\config

Answer 2

You should try to 1. Download and install all available updates from Windows Update 2. Download and install all SP for Windows 3. Reinstall .net framework