SSO Configuration Part Deux

Another problem arose when executing the Credentials.GetCredentials method in an event handler, received the following in the Event Log:

"The Microsoft Single Sign-on (SSOSrv) service failed to retrieve credentials for user NT AUTHORITY\NETWORK SERVICE, enterprise application definition Workflow. The error returned was 0x80630490. For more information, see the Microsoft SharePoint Products and Technologies Software Development Kit (SDK)."

Make sure that the MSSharePointPortalAppPool is configured to use an account with domain admin privs, and that the account is added to the IIS_WPG group.