ArcGIS license server administrator cannot start the workaround

   because ArcGIS License Server Administrator Unable to start properly , So you said you couldn't open it ArcMap, The following will happen ：

Here's my solution ：

  1. First of all in your License10.2 Found under folder service.txt text file , And open ：

   Here you need to change the local name of the file , Such as ：

About how to get the host name , I use this method ：

   First open the command line window , Then input hostname, You can get the host name ：

If there is still a problem that cannot be opened ： “Not_set”, Do the following ：

   open ArcGIS Manager , take Not_set Change it to localhost that will do ：

   Last , Successfully opened ：

   This is when I operate , Problems encountered , I hope it can help you .