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If I understand you correctly you captured packets on one system but not on the other. Then it stands to reason that you need to look at all components in that network. Be they physical or virtual.
For example see if you can see packet drops on the swith. See if you can look at packet drops on both servers on the relevant interface.
With stuff like that that you need to fill in the blanks. Every component my be a cause for this sort of trouble.
I'm afraid there are no easy answers here.