Re: Port 25
If you can move the server off that port your should do. As already mentioned, port 25 is the SMTP port. Even though you might not (you don't specify) be running a mail server on that port, if it's identified as open you're asking for trouble.
How would you application cope with a relentless barage of spammers trying to connect thinking there is an SMTP server on it they can use?
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