A while back I posted a fix for a small issue I was having in my vCenter regarding dozens of queued tasks with the name “Check new notifications.” While restarting WUM and cleaning the tasks fixes the issue for a small time, eventually the issue returns. While the trouble still lies with the Update Manager, you’ll want to look into the plug-ins on your vCenter server instead of the services.
The short answer: Install the VMware vCenter Update Manager Plug-In. You’ll find the Plug-In section of vCenter under “Plug-Ins > Plug-In Manager” Be sure and do what the installation files says. No reboot is required. I attached a screenshot below:
Don’t forget to clear out all of those nasty queued items when you’re done. Here’s the PowerCLI Command for those of you afraid of your mouse:
get-task -status queued | stop-task
Let me know if this helps. Cheers!