Unblocking .NET DLLs on Mac Catalina

Thu, 31 Oct 2019 00:00:00 +0000

There’s a new headache in town. If you run self-hosted Azure DevOps agent, or .NET Core project, on a Mac running Catalina (v 10.15+) and Microsoft Edge, you will have noticed a new behavior where the OS prevents the .NET assembly from working.

This is because it has been marked with a “quarantine” file attribute when it was downloaded with the browser. It’s a security measure that I’m familiar with on Windows. I would typically remove this attribute by right clicking on the file, select “Properties”, then check “Unblock”:

MacOS on DVLUP

Unblocking .NET DLLs on Mac Catalina