Ethernet via Belkin Thunderbolt Express

Culprit was in the AC circuit. (Powerline extender wasn't working). Have now connected with 15m ethernet cable directly between Modem and MBP and also Modem and Belkin dock. Both situations work perfectly. Thanks for your help and advice.

Sorry for delay, have been trying to understand the problem. I have disconnected everything and now think that the culprit may be the Powerline extender. I plugged into the modem directly with just the MacBook Pro and can get ethernet, same with Belkin dock, but not in studio via Powerline extender. I have two other rooms using Powerline extender for TV and one in garden for security. All three work fine. I have swapped extenders to see if it is this particular extender but it is not. So it seems the computer suddenly will not work with an extender. I am now considering just using a retractable 15m ethernet cable (if I can find one) directly linking modem and MBP and by-passing Belkin dock.

System report>Network>Ethernet

Ethernet:

  Type: Ethernet

  Hardware: Ethernet

  BSD Device Name: en0

  IPv4 Addresses: 169.254.219.47

  IPv4:

  AdditionalRoutes:

  DestinationAddress: 169.254.219.47

  SubnetMask: 255.255.255.255

  Addresses: 169.254.219.47

  Configuration Method: DHCP

  ConfirmedInterfaceName: en0

  Interface Name: en0

  Subnet Masks: 255.255.0.0

  IPv6:

  Configuration Method: Automatic

  DNS:

  Server Addresses: 8.8.8.8, 8.8.4.4, 1.1.1.1, 9.9.9.9

  Ethernet:

  MAC Address: 3c:07:54:41:0f:09

  Media Options: Full Duplex, Flow Control

  Media Subtype: 100baseTX

  Proxies:

  Exceptions List: *.local, 169.254/16

  FTP Passive Mode: Yes

  Service Order: 0

Also, While in 'Network', trying to make a new location, I seem to have lost the default 'Automatic' . Can I retrieve this?

Any suggestions v welcome. Thanks.

Thanks for replying. No the router doesn't limit.