Red X by LAN icon

I see that similar problems have been discussed before, but no suggested solution seems appropriate or effective.

Situation is that hitherto my router (Billion 8800NL) has been connected to my computer by Ethernet, and there are wireless connections to two items, and Powerline to another. Today I opted to remove the Ethernet from router to computer to gain some position flexibility Since then a red X is by LAN icon in Network Connections, but everything works as it should apparently.

Should I be concerned at the X's presence, and if I should, what action need I take to solve? Please

So far, no, as I want to keep, if possible that positional flexibility. ATM router and computer box are within 5' of each other. one on top of the desk, the other on floor diagonally through desk pedestal. Signal by computer is no that strong @ ~ -75 dBm through DW1525 (802.11n) WLAN PCIe Card. The other adapter is Realtek PCIe GBE Family Controller

Sorry for any irrelevancies.

Duplicate post

Thank you! Why that never entered my head is a puzzle. Must be age!:)