Veeam backup error – File does not exist or locked

Problem

Veeam back up of a MSSQL DB server throws the following error (some content changed):

Error: Client error: File does not exist or locked. VMFS path: [datastorename] servername/serverfile.vmx Please, try to download specified file using connection to the ESX server where the VM registered. Failed to create NFC download stream. NFC path: [nfc://conn:192.x.y.z,nfchost:hostname,stg:datastore@servername/serverfile.vmx]

A reboot of the server does not help.
A shutdown of the server and the running of the Veeam backup works but that means the DB server has to be down during that time.

Solution

Simple solution that works:
Go to services (services.msc), stop Veeam services
Download Veeam v9 and run the upgrade
Rerun backup job with no changes

myiten_veeamv9

If your issue is not Veeam related, check out this KB from VMWare: link to VMWare

Tested Platform

VMWare Esxi 6.0
Veeam Backup and Replication v8
Veeam Backup and Replication v9
VCenter Appliance 6.0
MS SQL 2012 Server Standard

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