Different procedures are required for regular and automatic license servers. Both versions are provided here.
To restart a Mac OS X license server
Enter the following in Terminal:
./lmgrd-c acad.lic-1 debug.log
To stop an automatic Mac OS X license server
Enter the following in Terminal:
sudo /sbin/SystemStarter stop adsknlm
To restart an automatic Mac OS X license server
Enter the following in Terminal:
sudo /sbin/SystemStarter restart adsknlm