It is certainly fine to make this change. I won't be making it in the vanilla configuration because as you know, Kaltura can be installed in many ways with different role[s] per node and so, since the same config file is used in all cases, it should remain this way by default. Indeed, for a standalone server, there is no need for Sphinx to listen on anything but the loopback I/F [127.0.0.1] and hardening is always a good idea:)
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