@Kuntumi
If that's a message about an 'external' connection, that's typically generated by the television set, not a Sky device, and means the correct HDMI port for the Sky device has not been selected using the TV remote.
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Sky Glass 55" (on ethernet) & two Stream Pucks (one ethernet / one WiFi)
BT Halo 3+ Ultrafast FTTP (500Mbs), BT Smart Hub 2
