If you are having problems starting Alfresco in Salesforce, it might be because you have not configured Chatter. Here is a sample error message if Chatter is not enabled:
GET request for "https://na30.salesforce.com/services/data/v23.0/chatter/users/me" resulted in 403 (Forbidden); invoking error handler
Make sure that you have Chatter enabled. To do this, access the Chatter Settings page, enter Chatter in the Quick Find box in Salesforce and select Chatter Settings.