HTTP Status 404 or Service Unavailable messages - HTTP Status 404 or Service Unavailable messages - Alfresco - Alfresco Content Connector for Salesforce - Alfresco/Alfresco-Content-Connector-for-Salesforce/2.2/Alfresco-Content-Connector-for-Salesforce/Alfresco-Content-Connector-for-Salesforce/Using/Troubleshoot-Salesforce-Connector/HTTP-Status-404-or-Service-Unavailable-messages - 2.2

If you see an HTTP Status 404 message, The server refused the connection, or a Service Unavailable message, check that the correct Share URL is specified in the Canvas App URL in Salesforce, and that Alfresco is running. See Step 3: Configure app in Salesforce for more guidance.