Open the policy covering the ASR rule(s) for editing.Open the Group Policy Management Editor by launching gpmc.msc from the Windows Start menu.Finally, click Save to save your endpoint protection profile.Īfter the changes propagate across users’ computers, you can try to install the COM Add-in once again.2. Adding the exception to ASR rules in Intune. Click Review save to save your change.įig. Add C:\Windows\System32\rundll32.exe as an exception by pasting it into the text box, as shown in Fig.Follow the instructions outlined here to access your existing endpoint protection profile that includes the ASR rule(s).After installing the COM Add-in, we recommend that you remove the exception to maintain your desired level of protection.įollow the instructions below to add the exception globally by using: To solve the problem, you need to temporarily add C:\Windows\System32\rundll32.exe as an exception to the Attack Surface Reduction rule(s) you have in place.Īdding any exception to the ASR rules might reduce the level of protection they offer. When you look closely at Windows Defender Antivirus logs, it turns out the installation is blocked by Attack Surface Reduction (ASR) feature. 1. The error generated by the improperly installed COM Add-in. On opening Outlook for Windows, you get the following or similar error:įig. When you or your users install the COM Add-in, Windows Defender Antivirus might block the process in the background, which results in a corrupted installation of the add-in. The COM Add-in continuously requires restarting OutlookĪdd-in installation blocked by Windows Defender Antivirus.Add-in installation blocked by Windows Defender Antivirus.Read on to learn about encountered problems, their causes and recommended solutions. See the user’s manual to learn how to deploy it. It’s easier to deploy (automatically via Microsoft 365 admin center) and it is an agentless solution (there’s nothing to install by end users, and there are no local library dependencies). You can avoid these problems by using our modern Signatures Web Add-in for Outlook instead.
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