Windows "Sleep Mode" prevents computers from obtaining a license use

If the computer you are using as a license server goes into sleep mode, other computers on the network cannot obtain a license.

To avoid this possibility, set Sleep Mode on your license server computer to Never.

To set the Sleep Mode to “Never”:

1. In Windows 8.1 Professional, Windows 10, or Server 2012 Standard, click Start > All apps > Control Panel > System and Security > Power Options.

   In Windows 7, click Start > Control Panel > System and Security > Power Options

2. Select Change when computer sleeps.
3. From the Put computer to sleep list, select Never.