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ENETUNREACH and ENETDOWN were not in the list of retriable errors on non-Windows platforms, so a single failed connection aborted the transfer instead of being retried as a low level retry. The Windows list already includes the equivalent WSAENETUNREACH and WSAENETDOWN. This is easy to hit on a host with IPv6 enabled but no IPv6 route: if the A lookup fails transiently while the AAAA lookup succeeds, the only address to dial is IPv6 and the connect fails with ENETUNREACH. A retry resolves again and normally succeeds.