If you expose 3390 to the internet, brute force scripts will find it in under an hour. Move the port, but also:
In the world of networking, port is most famously known as the primary alternative to port 3389 , which is the default for Microsoft's Remote Desktop Protocol (RDP). Using 3390 is a common security tactic known as "security through obscurity". By shifting traffic away from the standard port 3389, system administrators can: 3390 port
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