There is a pop up unhandled exception throw every night.
System.Security.Cryptographic.CryptographicException
http://blogs.technet.com/b/stefan_gossner/archive/2010/05/10/common-problem-with-sharepoint-2010-system-security-cryptography-cryptographicexception-keyset-does-not-exist.aspx
I search online ,find the blog. It is good to know.
If you see this error message from SharePoint 2010 you can relax, nothing bad is happening. When SharePoint 2010 and Visual Studio 2010 are both installed on the same machine you may see this error every 24 hours. This occurs when the OWSTimer service has a regular process recycle and in the shutdown of the old process an exception is raised. The exception doesn’t interfere with the normal process shutdown and recycle and is only ever seen if you have a JIT debugger installed on the machine. You should never see this error on a production SharePoint 2010 server, because you should not be installing Visual Studio 2010 on those servers. You can safely ignore these exceptions and close the window, or leave it there. You actually cannot debug the process, because it will already have been closed by the time you click the button and start your debugger.
To configure the server to no longer show a dialog when an unhandled exception occurs, use the registry editor to delete the following registry keys:
- HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AeDebug\Debugger
- HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\DbgManagedDebugger
- HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\AeDebug\Debugger
- HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\.NETFramework\DbgManagedDebugger
http://blogs.msdn.com/b/pandrew/archive/2010/05/25/benign-owstimer-unhandled-exception-popup-system-security-cryptographic-cryptographicexception.aspx
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