Recently at my firm, we started using Tekla with a server PC, with 6 PC-s all using Tekla. After a month of doing it, we got an e-mail, telling us about the illegal copyright infringement (even though we disabled internet connection to all tekla .exe files via firewall setup). We received a list of all the computers MAC addresses, all the versions we used, all the modules we used etc. So if you see Tekla Structures cracked, don't rush into setting it up, or else you'll have to pay when you receive this e-mail (we payed about 100.000$ (converted) for 4 licenses in only Steel detailing).
Tekla license server and Tekla Structures workstations need to be in the same local area network. The workstations need to be able to contact the license server. The internal firewall of your company (for example, Windows Firewall) must allow the communication between the server computer and the Tekla Structures computers. You need to allow the applications tekla.exe and lmgrd.exe to operate through the firewall. The applications are located in the ..\Tekla\License\Server folder. If there is no local area network in your company, we recommend that you install the license server on each computer that Tekla Structures is running on, and activate one license on each computer.
The MAC address of your network adapter where the license server is installed should not be changed. In case you are using a virtual environment, ensure that you are using static MAC addressing instead of dynamic MAC addressing.
The IP address of your license server should be fixed.