![]() I tested this in a virgin VM, and when SAC is on it is not possible to run anything unsigned, not even self-signed. David did a test in a fresh Windows 11 22H2 VM and wrote: He told me, that Smart App Control internally exactly seems to be realized via SRP – at least if that feature is not switched off, all processes access "\Device\SrpDevice". German blog reader David Xanatos suspected, that it has something to do with Smart App Control. So after all, the observation, Will Dorman has mentioned on Twitter, has been confirmed from more users. My first look was at my existing installation which was updated to 22H2. SRP policies "All files, All users and certificates", set of rules: %userprofile%\*.exe, %userprofile%\*\*.exe = not allowed. New installation, standard ISO, no volume CD, installation Professional Edition in Workgroup and in AD. I ran across the same problem in mid-October and was able to figure out that SRP on Win11 22H2 Pro did not work for me: see the forum entry (German) Richtlinien für Softwareeinschränkungen werden nicht angewendet.Īfter I contacted Mark Heitbrink again, he did run another test case and came back with the following German comment: German blog reader Johannes commented here: I mentioned this behavior within my German blog post, and know I got two other independent confirmations. Will Dormann has one machine, where SRP works, on all other systems SRP fails to block applications. Then I asked Will Dormann for details and he answered on Twitter: Especially my ex MVP colleague Mark Heitbrink commented, that his Win 11 22H2 system uses SRP as know before. I just came across this on Twitter via the following Tweet from Will Dormann that Microsoft now has removed Software Restriction Policies (SRP).Īddendum: After I published the German edition of this blog post first, I've got a discussion "Fake news, Software Restriction Policies (SRP) works as expected" within this blog. But with the discontinuation, administrators should have long been warned that this security feature will eventually fail. Until now, however, Software Restriction Policies (SRP) were still supported in Windows 10 as well as Windows 11 version 21H1. The Microsoft article Deprecated features for Windows client, which was last updated on November 2, 2022, also lists the Software Restriction Policies as deprecated. Software Restriction Policies in Group Policy: Instead of using the Software Restriction Policies through Group Policy, you can use AppLocker or Windows Defender Application Control to control which apps users can access and what code can run in the kernel. ![]() Microsoft already wrote about Windows 10 version 1803: However, Microsoft had already discontinued the Software Restriction Policies (SRP) in June 2020 (see my blog post Windows 10 Version 2004: Deprecated/removed features). I still read (also within my German blog in user comments) some recommendations to use software restriction policies to harden the system. In addition, software restriction policies are supported in Windows clients (Windows 7, Windows 8.1, Windows 10, Windows 11 21H1). The Software Restriction Policies are already available since Windows Server 2003 and are currently (according to this Microsoft page) still available under the following server variants: ![]() Software Restriction Policies (SRP) are a mechanism, with which administrators in Windows could specify over guidelines, which software may be executed in the operating system. Software Restriction Policies (SRP) deprecated
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