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Janet, I think I see what the problem is. The downstream LDM on the ground tries to contact the LDM server on the plane using the last known IP address when it hasn't received a product for 60 seconds. If the IP address is no longer valid, then the attempt times-out (it SHOULD get an error instead -- shame on the ISP). To the downstream LDM, a simple time-out is insufficient reason to break the connection and reconnect. I'll have a solution for you tomorrow. Regards, Steve Emmerson