You need to allow the applications tekla.exe and lmgrd.exe to operate through the firewall on the license server computer to enable licensing traffic. The instructions below apply to Windows 7, 8, 8.1, 10 and Windows Server 2012.
To allow exceptions for lmgrd.exe and tekla.exe on the license server computer:
Administrator permission is required. If you're prompted for an administrator password or confirmation, enter the password or confirm.
By default, the path is ...\TeklaStructures\License\Server.