The following error will happen as a result of the SSO keystore files having a blank password. You will see the following error in sso-idp.log and you will also see the following on the login screen after attempting to login.
The SSO certificate used for integrations with SBM and Version Manager expired on June 15, 2015 for some older versions of SBM. Since that date you may see errors like the following in the sso-idp.log file that happen quite frequently.