From the LabTutor Server computer open a command prompt window by looking in All Programs > Accessories and right click on the command prompt item, then select 'Run as Administrator'.
Once the window opens type netstat -oan. This will provide a list of all the listening services, the port it’s using, and the process ID. This information can then be provided to your IT Administrator. The most common scenario is that these ports are already in use by Skype. There is a separate FAQ for this issue.
Please note that restarting the computer may be required for any changes to the port configuration of third-party software to take effect. The port settings for LabTutor Server cannot be changed.