Turn on Windows Defender

S

Simon Barrett

We have a situation where we are running a published desktop on server 2016 and had a third party Anti-Virus installed so Windows Defender was disabled by Group Policy. We are now trying to remove the Third Party AV and turn Defender back on. However, I cannot find any automated way to get Defender back up and running. There is no "Enable/Turn On Defender" GPO that I can find. Only the Turn Off Defender GPO; which disabling doesn't work(I wouldn't expect it to work). The only way I have found to turn it back on is to press the "Turn on Windows Defender" button in the Windows Defender UI in Settings. 1104885.png

I have even gone so far as to capture the processes that happen when I do that using Process Monitor and can't find anything useful in there. All the websites that talk about configuring Defender with PowerShell have nothing to actually turn it on they all assume it is on or that you want to turn it off.

Has anyone dealt with this?

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