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What happened to single packet authentication? As someone who has casually run hosts, I've been disabling password and setting up keys for most of the 10+ years. Always been curious about SPA though, it seems like a decent way to protect a service, better than firewalling IP ranges and changing ports, no?

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A client I work with uses Appgate SDP which uses SPA to do exactly that. I haven’t seen SPA come up often other than that.

For this particular client it was a hard requirement for them to even consider allowing access from public internet.

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