Two things for you to try:
- In KEPServerEX, in project properties, under the ThingWorx tab, make sure Enable is set to Yes.
- Next, if the computer running ThingWorx is separate from the computer running KEPServerEX, make sure that the firewall is open on the Thingworx host machine for connections on whatever port you configured in the installer (in your case 9080)
Did you attempt to configure the connection through the KEPServerEX monitoring tool or through the composer? Doing it through the composer is not recommended, as if you use the KEPServerEX monitoring tool, it automatically generates a connection using the best practices found by our R&D team.
If you view the site where you downloaded the applications/installer you can view several videos and tutorials on how to configure these connections, I've added links to the relevant video and documentation.