Have you got this error message when you start AutoCAD?
The network license manager was not able to get a valid license. If this problem continues, please contact your system administrator. Error [1.5.-4]
This error indicates that no network licenses (FLEXnet/FLEXlm) are available to be checked out. All available licenses are either reserved for other users or are currently in use.
Knowledge Base document: Network licensing error [1.5.-4] when starting the software