To change the license server and vendor daemon TCP port please open http://localhost:8090/ with a web-browser on the license server machine and log in to the administration area (the default user/pass is admin/admin)
Change license server TCP port
Open the 'Server Configuration' tab and click on 'License Server Configuration'. Choose a free port number between 27000-27009 and confirm with 'save'.
Change vendor daemon TCP port
Open the 'Vendor Daemon Configuration' tab and click on 'Administer'.
Choose any free port number and confirm with 'save'.
You need to restart the 'eCognition License Server' service under the Windows services to finish your changes.