Backup fails with VDDK 6.0 when proxy has IPv6 enabled

If a VSA proxy has Internet Protocol version 6 (IPv6) enabled on a network interface that is used for backups, a virtual machine backup using Virtual Disk Development Kit (VDDK) 6.0 fails when trying to open a disk on the proxy. 

For SAN backups, this issue can cause the proxy to crash. 

This issue is the result of a known issue with a DLL used by VMware. The issue can occur when IPV6 is enabled on any network interface used for the backup. This issue is unresolved as of this writing.

VMware has acknowledged this as a known issue for VDDK 6.0. For more information, see Backing up a virtual machine using Virtual Disk Development Kit (VDDK) 6.0 fails while attempting to open a disk on the Windows Proxy (2125497).

As a workaround, disable IPv6 on all network interface cards for the VSA proxy and then reboot the proxy. 

1. Disable IPv6 by configuring the following registry key on the proxy:

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters\DisabledComponents

   The type of this registry key is DWORD (32-bit) Value. Type 0x11 to disable all IPv6 interfaces except the IPv6 loopback interface.

2. After configuring this registry key, reboot the proxy.

For more information, see How to disable IPv6 or its components in Windows.