I tried
C:\dev>aspnet_regiis -pc "NetFrameworkConfigurationKey" -exp
Creating RSA Key container...
The RSA key container could not be opened.
Failed!
and
C:\dev>aspnet_regiis -pa "NetFrameworkConfigurationKey" "ASPNET"
Adding ACL for access to the RSA Key container...
The RSA key container was not found.
Failed!
Both failed. Any idea?