Sorry to hear about your issues, but I need some more detail please from your end such as what type of error message and what do you mean by ping? From the ET itself?
In any event, it is worth resetting the Tobii EyeX Settings by uninstalling the SW,
removed the following registry entries and reinstall the Software.
HKEY_CURRENT_USER — SOFTWARE — Tobii
HKEY_LOCAL_MACHINE —- SOFTWARE —- WOW6432Node —- Tobii