A VSS writer has rejected an event with error 0x800423f4 The writer experienced a non-transient error. If the backup process is retried the error is likely to reoccur. Changes that the writer made to the writer components while handling the event will not be available to the requester. Check the event log for related events from the application hosting the VSS writer
This message is logged on a Windows 2008 R2 virtual machine during a backup job using Backup Exec Agent for VMWare Virtual Infrastructure. From the guest machine check the status of the writers from the command prompt (C:\>VSSADMIN LIST WRITERS ). All writers should be reporting "Stable No Error" if not reboot the guest machine and try the backup job again.
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