On Mon, Nov 23, 2015 at 12:52 PM, Martin Thomson <[email protected]> wrote:
> The problem is that it the ACME server needs some sort of assurance > that the client controls the server. Showing control over the server > on port 443 is probably the best signal possible. > > Showing control over a server on ports < 1024 might be OK. Some > operating systems require additional privileges to serve on those > ports. That said, it's not universal, though I'm not sure whether it > matters for those cases where <1024 is available without access > controls. > How does showing control over port 443 convey more information than showing control over port 22, 80, 487, 1023?
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