Hi,
Did you let us know what pop up when you open the eBay? Did you open it through the desktop Internet Explorer or new UI Internet Explorer?
For all Windows Store app, run the App troubleshooter to see if it could resolve:
Troubleshoot problems with an app
http://windows.microsoft.com/en-IN/windows-8/what-troubleshoot-problems-app
Also do other steps in that article to have a try.
In addition, for the Internet Explorer connection, refer to this guide:
"Internet Explorer cannot display the webpage" error
https://support.microsoft.com/kb/956196
Karen Hu
TechNet Community Support
