Locate the configuration file at C:\ProgramData\PresentationPoint\iPoint Server.xml. Open this file with a text editor like notepad. Look for the text <add key="ServerPortNumber" value="8000" />
This "8000" value represents the port number being used for your iPoint communication. Change the number to e.g. "9000" and save the xml file. Make sure you respect the correct XML syntax. Then restart your iPoint server service in order to activate this new setting.