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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.

If this KB article did not resolve your issue or you need further assistance with Veeam software, please create a Veeam Support Case.

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