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Cryptographic Services failed while processing the OnIdentity() call in the System Writer Object.
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In some cases the problem is that for the system state backup there is a maximum limit for folders and files for %windir% directory. In case the number is exceeded system state backup will fail, System Writers will disappear from vssadmin writers. This may happen in consequence of an installation of Visual Studio or SharePoint Server.
Microsoft has provided a hotfix:
You cannot back up the system state on a computer that is running Windows Server 2008 R2 or Windows Server 2012 (ME2807849).
See Social Technet Discussion for further information: EV100581 (Missing VSS System Writer and CAPI2 error in Event Log)
A workaround may be to move the "Temporary ASP.NET Files" directory. Here you find a step-by-step instruction: EV100582 (Disappearing VSS System Writer and ASP.NET).
The following sequence of commands resets the permissions and restores the System Writer, at least until some update corrupts the permissions again:
Takeown /f %windir%\winsxs\filemaps\* /a
icacls %windir%\winsxs\filemaps\*.* /grant "NT AUTHORITY\SYSTEM:(RX)"
icacls %windir%\winsxs\filemaps\*.* /grant "NT Service\trustedinstaller:(F)"
icacls %windir%\winsxs\filemaps\*.* /grant "BUILTIN\Users:(RX)"
Try listing permissions before you try this, since your situation could be different than ours. The following command will save the listed permissions to a file, but will fail if your permissions are also corrupt:
cd /d c:\windows\system32
icacls %windir%\winsxs\filemaps\* > C:\acls.txt
Since you obviously may not get a good backup of this before proceeding, be aware that there is no guarantee this won't make things worse!
See the link to T734021 for information on solving this problem.
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