A common problem after setting up SharePoint 2010 is to get the System.Security.Cryptography.CryptographicException – Keyset Not set error.
A few notes regarding this:
This is a known issue with .NET and SP2010.
It is not a critical issue however.
The Timer service is recycled every so often to reclaim system resources. The exception is thrown during the shutdown process. […]
Blog Post by: kadasani