If the connection to a Revit application workstation's assigned Revit Server Accelerator is lost, the application workstation will automatically connect directly to the Revit Server Host for the central model.
(The user may have the option of connecting to the Host through a different Accelerator if one is available; see Managing the Revit Server Accelerator Connection).
If the connection to a Revit Server Host is lost, you can continue to work on elements that you already own. However, you cannot access new elements or synchronize with the central model until the WAN connection is reestablished.