Windows Defender is uninstalled after installing F-Secure Server Security 15.10 on Windows Server 2016 - WithSecure Community
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<h3 data-version="4" data-article="000034029" data-id="issue">Issue:</h3>
<p>Windows Defender was uninstalled after installing F-Secure Server Security 15.10 on Windows Server 2016.<br>On ESS manual (SS should be the same as well) describes below.<br>===<br>After installing the product on Windows Server 2016 or newer, you need to explicitly disable or uninstall Windows Defender.<br>===<br><a href="https://help.f-secure.com/product.html#business/email-server-security/15.00/en/task_423BA82B96694FA2A64F7EDE3787C225-15.00-en" rel="nofollow">https://help.f-secure.com/product.html#business/email-server-security/15.00/en/task_423BA82B96694FA2A64F7EDE3787C225-15.00-en</a><br><br>Does this mean that Windows Defender is not automatically uninstalled even though "Switch off Windows Defender during installation" is enabled?<br>Is this expected behavior?<br>There are other servers which Windows Defender was not uninstalled but it was just disabled. What is the difference?</p>
<h3 data-id="resolution">Resolution:</h3>
<p>Actually Server Security uninstalls Windows Defender from the server.<br>But it will be enabled back upon our product uninstallation.<br><br>In case, it's necessary for Windows Defender to get back without uninstalling our product, they can run this command in powershell with admin rights.<br></p><pre class="code codeBlock" spellcheck="false" tabindex="0"><br>powershell Install-WindowsFeature -Name Windows-Defender</pre>
We don't actually log the output of Windows Defender disabling attempts - there could be different reasons why Windows Defender can't be uninstalled in some cases, e.g., GPO settings on the server.<br><br>Customer can, for example, try the command
<pre class="code codeBlock" spellcheck="false" tabindex="0"><br>powershell Uninstall-WindowsFeature -Name Windows-Defender</pre>
by themselves on the affected server, and see if it works.<br>
<p>Article no: 000034029</p>
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