Clients (end users) of ArcGIS Desktop get a warning prior to expiration of a running concurrent license period, e.g. 15 days before the end (see image in attachment). This also occurs if the following license period, e.g. for one year, has already been set up. The system is not able to recognize that there is 1 year and 15 days of license available. It's recommendable to avoid license expiration warning if the new license period has already been implemented. This should occur from server side.