No cash register connection doesn't necessarily mean that the terminal can't connect to your cash register, but rather indicates it can't connect to the Pay PIN server. This can have several causes:
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Ethernet Connection: Ensure the Ethernet cable is correctly plugged in. Avoid connecting it to a laptop's UTP port, as this usually doesn't provide the required Ethernet signal.
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Network Configuration: Check if the Ethernet cable is connected to a port with an active internet connection, preferably directly to your router.
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Network Policies: The terminal communicates with multiple channels and IPs. If the network policies are too strict, certain ports and IP addresses may need to be whitelisted to allow the terminal to process incoming and outgoing messages.