Hello Guys..Currently we are using Computer Associates (CA) backup application - for Exchange 2007 - during the execution of backup i used to get error in the CA backup manger console - saying the backup is failed - but when i check the Event ID in the Exchange server i used to get the below mention error.When i try to run the command "vssadmin list writers" i see that Exchange is not stable - BUT if i leave this just for one day and again run the command i can see the Exchange is stable without doing anythink - so guys could you please let me know why this strange behavior - could you please let me know what is the work for this solution.BTW: This even happen with our previous version Exchange 2003 - this error occurs some time and it automatically disappears after comes back after a month or soo.Infact this is quit triggy problem EventType:Error EventSource:VSS EventCategory:None EventID:8194 Date:11/19/2008 Time:8:37:06PM User:N/A Computer: SERVERNAMEDescription: VolumeShadowCopyServiceerror:Unexpectederrorqueryingforthe IVssWriterCallbackinterface.hr=0x80010100

Hi, Are you running windows server 2003? Then this might help: http://support.microsoft.com/kb/833167 Leif

Thanks for your help - before i proceed installing this hotfix i need to clarify some points.Currently our setup is 1. Win2003 Ent with SP2 and with all latest hot fixes 2. Exchange 2007 ( Mailbox Server)3. Windows Cluster (Active / Passive) So my question is when i have SP2 for windows - does this hotfixes applies to resolve this issue ?Note; Our Exchange 2007 is without SP ( Due to some internal security issues)Anticipating your response

Please try to troubleshoot the issue based on this article Hr = 0x80010100 shows that a system call failed [Based on Return Value List] General steps to troubleshoot VSS 1. Check the QFEcheck.txt in the to find if any Hotfix is not installed properly 2. Check the following registry files. If there is any change fix it and try backup. If it failed, move to Step 3: [HKEY_CLASSES_ROOT\CLSID\{FAF53CC4-BD73-4E36-83F1-2B23F46E513E}] Name: (Default) Data: VssEvent Name: AppID Data: {FAF53CC4-BD73-4E36-83F1-2B23F46E513E}" [HKEY_CLASSES_ROOT\CLSID\{FAF53CC4-BD73-4E36-83F1-2B23F46E513E}\InprocServer32] Name: (Default) Data: C:\WINDOWS\system32\ES.DLL" Names: ThreadingModel Data: Both [HKEY_CLASSES_ROOT\CLSID\{FAF53CC4-BD73-4E36-83F1-2B23F46E513E}\ProgID] Name: (Default) Data: VssEvent.1 [HKEY_CLASSES_ROOT\CLSID\{FAF53CC4-BD73-4E36-83F1-2B23F46E513E}\VersionIndependentProgID] Name: (Default) Data: VssEvent 3. Re-registered the following DLLs. If it failed, move to Step 4 a. Net stop vss b. Net stop swprv c. Go to system32 folder by typing d. CD %systemroot%\system32 regsvr32 ole32.dll regsvr32 vss_ps.dll Vssvc /Register regsvr32 /i swprv.dll regsvr32 /i eventcls.dll regsvr32 es.dll regsvr32 stdprov.dll regsvr32 vssui.dll regsvr32 msxml.dll regsvr32 msxml3.dll regsvr32 msxml4.dll regsvr32 Vssapi.dll regsvr32 Vssui.dll e. Net start vss f. Net start swprv 4. Reset the DCOM settings. If still no luck move to Step 5 secedit /configure /cfg %windir%\repair\secsetup.inf /db secsetup.sdb /verbose 5. Reinstall Com+ a. Backup and then delete HKLM\Software\Microsoft\COM3 b. Boot to Recovery console and rename clbcatq.dll to ~clbcatq.dll c. Boot to normal mode and in Control Panel, Add or Remove Programs tool, and then open the Add/Remove Windows Components tool. Do not make any changes, just click "Next". This reinstalls COM+. Notes: You must have your Windows Server 2003 SP1 files available during this step.

We have Exchange 2003 on windows 2003 server. In our backup product, while verifying client, we list vss writers available and check whether writer for Exchange is available. Output of 'vssadmin list writers' shows that 'Microsoft Exchange Writer' is stable and No Error. But our service not able to detect Exchange writer when we enlist available writers. But this happen only first time when we install product. Once we restart our service, problem gets resolved. Service is running under account that is member of Administrator and Backup Operators. Following event gets logged in event viewer Event Type: Error Event Source: VSS Event Category: None Event ID: 8194 Date: 3/31/2009 Time: 6:47:57 PM User: N/A Computer: EX-2003 Description: Volume Shadow Copy Service error: Unexpected error querying for the IVssWriterCallback interface. hr = 0x80070005. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: 2d 20 43 6f 64 65 3a 20 - Code: 0008: 57 52 54 57 52 54 49 43 WRTWRTIC 0010: 30 30 30 30 30 37 38 35 00000785 0018: 2d 20 43 61 6c 6c 3a 20 - Call: 0020: 57 52 54 57 52 54 49 43 WRTWRTIC 0028: 30 30 30 30 30 37 35 35 00000755 0030: 2d 20 50 49 44 3a 20 20 - PID: 0038: 30 30 30 30 31 34 31 36 00001416 0040: 2d 20 54 49 44 3a 20 20 - TID: 0048: 30 30 30 30 33 37 32 30 00003720 0050: 2d 20 43 4d 44 3a 20 20 - CMD: 0058: 43 3a 5c 57 49 4e 44 4f C:\WINDO 0060: 57 53 5c 73 79 73 74 65 WS\syste 0068: 6d 33 32 5c 6e 74 66 72 m32\ntfr 0070: 73 2e 65 78 65 20 20 20 s.exe 0078: 2d 20 55 73 65 72 3a 20 - User: 0080: 4e 54 20 41 55 54 48 4f NT AUTHO 0088: 52 49 54 59 5c 53 59 53 RITY\SYS 0090: 54 45 4d 20 20 20 20 20 TEM 0098: 2d 20 53 69 64 3a 20 20 - Sid: 00a0: 53 2d 31 2d 35 2d 31 38 S-1-5-18