KB1727: How to forcibly stop jobs that are stuck in ...
https://www.veeam.com/kb172701.03.2013 · Open the Task Manager on the Veeam Server and kill all VeeamAgent.exe processes. Note: Some VeeamAgent.exe process will be located on Source Proxies and Windows Repositories that are not the Veeam Server. Wait 5-10 minutes for the tasks to timeout and fail. Remove snapshots from VM (s) that are part of the stuck jobs.