Hello Ferhat,
Please examine your license file and make sure that the host ID on the SERVER line matches that of the machine. Edit the license file like so: replace the string 'put_server_name_here' with the name of the license server machine. Then on the DAEMON line replace the string 'path_to_mgcld' with the location of the vendor daemon, mgcld.exe.
Stop and restart the license service in Lmtools>Start/Stop/Reread tab.
If this does not clear up the problem, please open a service request.
Regards,
Joy