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Tuesday, July 9, 2019

How to See if Zoom Is Running a Secret Web Server on Your Mac (and Remove It)

Zoom logo

Zoom, a popular video-conferencing application, is in hot water today. The Mac version runs a secret web server in the background—even after you uninstall it!—that can be used to reinstall Zoom and even turn on your video camera.

If you’re wondering whether you’re affected—maybe you’re not sure if someone has ever installed Zoom on your Mac and then uninstalled it—here’s how to check.

To see whether you have the main Zoom app currently installed, open the Finder app, select Applications, and look for “zoom.us” in the list. If you have this app installed, you almost certainly have the web server running.

But, even if you don’t have the app here, the web server will still be running in the background if you’ve ever installed and then uninstalled Zoom.

Zoom application in Mac Applications folder

To check whether the server is running, open a Terminal window. To do so, press Command+Space to open Spotlight search, type “Terminal,” and press Enter. You can also head to Finder > Applications > Utilities > Terminal.

To discover whether the web server is running, type the following command and press Enter:

lsof -i :19421

If you see a “ZoomOpene” process running, the web server is running in the background. If you don’t, it’s not.

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