Once you've confirmed that TCP networking is working properly, the next step is to make sure the daemons are running on the server. This takes three separate tests because no single one of the following will decisively prove that they're working correctly.
To be sure they're running, you need to find out if:
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The daemon has started
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The daemons are registered or bound to a TCP/IP port by the operating system
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They're actually paying attention
