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  1. I use Netgear routers with multi-NAT capability to attach machines to the company LAN. One of the advantages is that similar machines can have identical network addressing schemes while a multi-NAT router on each machine can be used to assign unique external addresses. The usual error on these setups is to forget to assign a gateway IP address and so the PLC can't respond to requests from outside its subnet. I have the router set up as normal (as I have done a hundred times before on other machines). PLC has correct IP address, subnet and gateway (that of the router LAN address). Router has NAT rule configured, correct LAN subnet, etc. I can PING the PLC from the company network. This implies that the router, wiring, etc., are all OK. If I disconnect the PLC ethernet cable during a PING I get errors. This implies that the address is unique, etc. Controller --> Communication Setup --> Ethernet connection via hub --> Ethernet communication test --> "A communication error has occurred." Has anyone seen this? Any reason why it shouldn't work as I expect? Many thanks.