![]() Then I granted NETWORK SERVICE “Remote Access” in COM (the check box below the red circle in the diagram above) and the 8194 error stopped. I was getting the exact same error while running a Synology Active Backup for Business agent task. Latest version: 2.3.10 (MD5 hash: 92ADAC8B2FF0374443D6F9C8C8B143F5) Download the Remote Client for Cobian Reflector ONLY. NET runtime 4.6 or newer must be installed (4.6.2, 4.7, etc, but NOT 5.x). That change did finally stop the VSS 8194 errors. Download Cobian Reflector 2.3.10 For Windows Vista SP2, Windows 7 SP1, Windows 8, Windows 8.1 Windows 10 or newer and Servers 2008 or newer. Start dcomcnfg.exe, right-click on My Computer, select Properties, then grant NETWORK SERVICE Local Access to all COM components as shown: So I’m going with the change to default permissions as recommended by the above articles. Unfortunately, that wasn’t enough I still got the VSS 8194 errors. Writer Class Id: following the instructions in this blog post. This is often caused by incorrect security settings in either the writer or requestor process. Volume Shadow Copy Service error: Unexpected error querying for the IVssWriterCallback interface. If the error is consistently reproducible, make sure that the backup application vendor is following all the VSS backup session cleanup guidelines.After setting up a new Windows 10 desktop in an Essentials 2012R2 domain, every day when the Essentials backup runs, backing up the machine across the network, I see this error: However, these errors aren't related to the active backup or restore session. The related event is logged in response to garbage collection activities that are started by a backup or restore operation. Ignore intermittent occurrences of this error. This behavior is most frequently seen in test environments. You can see several similar events in rapid succession from multiple writers that indicate that there was a series of incomplete backup or restore sessions. The folder System Volume Information is almost empty. ![]() Run this task SCRENSHOTS - MBARW NOT RUNNING Screenshot1: Before run Cobian Backup task. The event log is intended to help identify abandoned sessions in the writer that may indicate a misbehaving backup application. Create of task in Cobian Backup using Volume Shadow Copy 3. The infrastructure then logs the previous event log for each session-state object that is older than two days. I will review the logs on the Server that was having problems creating the VSC in. Both worked fine and created VSC without errors. If a CBackup task is running, a task Reflector cannot create a new Volume Shadow Copy. The VSS writer infrastructure performs periodic garbage collection of the remaining session states. I needed to use Cobian Backup together with Reflector (split backups). The OnAbort event callback is invoked when the backup session is explicitly failed by the backup application, by the writer or, by the VSS infrastructure. The writers receive the OnAbort event callback for the session. The backup application sends a PostRestore response and then checks the writer status by sending a GatherWriterStatus query. The backup application sends a BackupComplete response and then checks the writer status by sending a GatherWriterStatus. Normal session state cleanup occurs under the following circumstances: Under typical circumstances, the writer session-state objects are cleaned up when they're not being used. The VSS writer infrastructure creates session-state objects for each backup and restore session in which a VSS writer participates. This error occurs because a backup or restore session state in the VSS writer isn't cleaned up correctly. A writer may have reached the limit to the number of available backup-restore session states. hr = 0x80042409, Writer status is not available for one or more writers. Volume Shadow Copy Service error: Unexpected error An older writer session state is being removed. During the backup or restore operation, an event that resembles the following is written to the Application log: You perform a Volume Shadow Copy Service (VSS) backup or a VSS restore operation. This article describes an issue that occurs when you restore a virtual machine while another backup that uses the Hyper-V writer is in progress.Īpplies to: Windows Server 2012 R2 Original KB number: 978773 Symptoms
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