When visiting the eBay.com site, a script will run that performs a local port scan of your computer to detect remote support and remote access applications. Many of these ports are related to remote access/remote support tools such as the Windows Remote Desktop, VNC, TeamViewer, Ammy Admin, and more. As the port scan is only looking for Windows remote access programs, it is most likely being done to check for compromised computers used to make fraudulent eBay purchases.
Source: Bleeping Computer
