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I'm experiment a strange problem:

I have a RUT240 in LAN with a modbus tcp/485 gateway (ADFWEB) and a PC.

I can ping RUT240 and ADFWEB from the PC so I'm sure both the devices are online. There's no way to let the RUT240 ping that device. If I try setting up the modbus communication (RUT240 as master, AFWEB as slave) i get a "no route to host", so it seems that the RUT240 is not "seeing" that ip address in its network. Of course, if i try modbus requests from the PC they are ok, so i am sure ADFWEB gateway is ok even on the modbus side.

What could the issue be?

Any suggestion is appreciated.

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Is the issue still relevant?

Did you check if the port used for connectivity is not blocked by the firewall?

Could you share you master and slave configurations?

Best regards,


the issue is no more relevant: was due to a bug on the gateway firmware. took some days to track and fix it.