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Can only speak for the current version (1.4.5), but it binds by default to all interfaces.

If a memcached was bound to non-public interface then it wouldn't be reachable from the internet (and you'd have to explicitly configure it as such). However, if you're running the cache and the app on separate machines, the cache will need to be reachable. For poorly thought out deployments this means publicly reachable.




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