"Address already in use" is the most misread error message in server operations, and the cost of misreading it compounds: the message names a symptom while hiding the verdict — which exact address-and-port pair is held, by which process, in
A bulk transfer between two continents is not limited by the bandwidth you paid for. It is limited by how many bytes the two endpoints are willing to keep in flight at the same time, and by default that number
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