Error message
ERROR Agent - System.Runtime.InteropServices.COMException (0x80042318): Exception from HRESULT: 0x80042318 at Alphaleonis.Win32.Vss.WaitCheckAndReleaseVssAsyncOperation(IVssAsync* pAsync) at Alphaleonis.Win32.Vss.VssBackupComponents.GatherWriterMetadata() at SOSOnlineBackup.Client.Library.Core.ShadowCopy.VssBackup.Init(IVssImplementation VSSImpl) at SOSOnlineBackup.Client.Library.Core.ShadowCopy.VssBackup..ctor(Boolean componentMode, Guid VSSWriterId) at SOSOnlineBackup.SAgent.MSSql.MSSqlBackupPerformer.RunBackup() at SOSOnlineBackup.SAgent.Agent.#=qmgPA_v29nwyXxtvLf9bzHg==(IBackupSession #=qXhnlys\$fBQFZDxm9B0T8qQ==)
Error description
The error can be found in the file SAgent.Service_vX.X.X.log in the application folders: C:\ProgramData\Online Backup and Recovery Manager\Logs or C:\ProgramData\SOS Online Backup\Logs.
Usually, the error code appears in Event Viewer.
Steps to resolve
Restarting the following VSS services may correct the issue: COM+ Event System Microsoft Software Shadow Copy Provider Windows Management Instrumentation Volume Shadow Copy.
Sometimes, re-registering the following VSS DLLs using the command-line prompt will help resolve VSS problems (requires reboot).
cd %systemroot%\system32
net stop VSS
net stop swprv
regsvr32 /s ole32.dll
regsvr32 /s VSS_ps.dll
regsvr32 /s oleaut32.dll
VSSvc /register regsvr32 /s /i swprv.dll
regsvr32 /s /i eventcls.dll
regsvr32 /s es.dll
regsvr32 /s stdprov.dll
regsvr32 /s VSSui.dll
regsvr32 /s msxml.dll
regsvr32 /s msxml3.dll
regsvr32 /s msxml4.dll
net start swprv
net start VSS
Once the DLLs are registered, reboot the server.
If any DLL cannot be registered, restart the server, and then register the DLL again.