LAN connection with ethernet cable

LAN connection with ethernet cable isn't working, message is Network: Coax not connected (9) and Internet (9).  All internet related addresses after manually entering under advanced say OK (I set them manually as they were wrong). Ethernet cable is connected to LAN as verified with separate device.  Appears that receiver is looking for connection via coax rather than RJ45 connector.  Service tech wasn't able to locate the ethernet cable so instead connected internet via a signal converter from the router to the coax line.  Receiver wasn't seeing internet so I removed the conversion and connected directly to the router with an ethernet cable and RJ45 connector.  I am thinking there is some setting in the receiver as to whether LAN is connected via ethernet cable or coax that only techs access. If so, I need to know how to change it back to ethernet. 

PS Interestingly viewing my account via DirecTV on line indicates that receiver is connected to the internet while the receiver indicates it is not.