My first thought is it could be an MTU problem.
Try running tcpdump at both ends - you should see the same packets (*).
If you find one side sends a maximum-sized packet, but the other side
receives nothing, then that's very likely the issue.
If you don't have access to the far side, then reduce the TCP MSS on
your side and try again. (Or at worst, just reduce the MTU on your
interface). At least you'll know if that's the problem or not.
Regards,
Brian.
(*) Maybe multiple packets will appear as one packet, if your NIC
reassembles TCP segments. Turning off TCP offload on your NIC can
sometimes be worth trying too.
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