SecureAuth IdP Version affected: 9.1, 9.2
Realms configured for Windows Integrated Authentication / Windows SSO with SAML Post Authentication experience an issue where after successful authentication, the following error is displayed. "RSA key container could not be opened"
There seems to be a bug with later versions of the IdP where CryptoApi functions are failing on a WindowsSSO realm.
Decrypt the web.config. This will be a temporary fix until the product bug can be resolved.