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vSphere 5.5/6.0 VM Backup fails with "Exception of type 'Veeam.Backup.AgentProvider.AgentClosedException' was thrown"

KB ID: 2903
Product: Veeam Backup & Replication | 9.5
Published: 2019-02-28
Last Modified: 2021-07-22
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Challenge

When backing up a VM within an environment running vSphere 5.5 or vSphere 6.0 the job fails with: 
 Exception of type 'Veeam.Backup.AgentProvider.AgentClosedException' was thrown
Version Requirement

The error listed above has many causes. Directly interpreted, it means that a process has terminated unexpectedly.

This article is explicitly related to when this error occurs during a job processing a VM located on an ESXi 5.0 or ESXi 6.0 host with Veeam Backup & Replication 9.5 U4

Cause

This failure is related to a known issue affecting VMware Virtual Disk Development Kit (VDDK) 6.0.

VDDK 6.0 is used by Veeam Backup & Replication to access VMs running in Vsphere 5.5 and 6.0. 

Solution

Disable IPv6 on all network interfaces of the Veeam Backup Proxies.
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