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troubleshooting help needed pls guys

Hi all

we are having an issue with an as2 trading partner since they changed there proxy for sending files to us, they basically use http on tcp port 6260, they transfer a file to us, they expect to recieve a http 200 ok message back, so, I went on our as2 server and did a packet capture, I can see these messages being generated,"tcp push ack" BUT, my packet capture software says "bad tcp checksum" it says 0xD193 BAD should be 0x5E2A , The psh ack number is 3056860052 , the return packet from them come back with tcp ack sequence number 3056860052, this comes back twice from them. would this traffic pass my firewall even with a bad tcp checksum? i gather so because I can see the return packet

Any ideas guys, we need to get to the bottom of this, your help would be much appreciated.

Thanks

Carl

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