"Failed to connect to Microsoft Single Sign-on Service. To configure, please ensure the service is running."
Go to Administrative Tool > Services
Make sure that Service is running, If server not running don't start service.
1. Logon as SharePoint SSO Service domain account
2. Go to Central Administration > Operation > Security Configuration
3. Click Windows Service drop down box and Select Single Sing-on Service.
4. Select Configurable option and Enter Service account username and Password.