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sc.exe uses RPC to connect to remote hosts; RPC calls always start with a control connection to TCP port 135, but then another connection is opened using a random dynamic port to carry out the actual RPC call; the range of these dynamic ports can be limited, but how many of them are needed depends heavily on what the computer is doing. Also, keep in mind ...


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I guess that this is only possible if the application that is bound to the port does the protocol switching. Usually there is no way to bind two applications/services to one port.


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Yes, there is. Depending on how much control you're giving the user over the content, it could range from "user can do mischief" to "you're a total open relay". As an example more at the "mischief" end of the spectrum, Redis has a fairly "permissive" command parser. It will ignore any commands it doesn't recognise, and then wait for a command it does. ...


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My apologies, but I think @wombies answer is wrong. The more logical answer (to what was probably meant) is this - You can allow SMTP communication on (almost) any port - the security does not come from the port, rather it comes from the access controls in the mail server to ensure only authenticated users can log in (be it by username/password or IP ...



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