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I'm writing an CIP-driver in C# for communication between a Rockwell PLC and a Raspberry Pi. Currently I'm debugging the Connect/Disconnect process. Everything works fine, I register a session, I start an start forward. When I press disconnect, I send an forward close to the PLC. En this seams to work. Only in Wireshark I see an error: "Destination Unknown". But I can't figure out why the destination is wrong. I filed everything in the correct order according to the table below.