I have the port open and working for root but it is not open for user XYZ. How can I open the port so that user XYZ can access it.
OS : Centos 6.9
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Ports numbers below 1024 are privileged and non-root users can't bind to them. How you work around it depends on your situation.
Programs usually drop their extra privileges by changing to non-root user after binding to a port. If that is not an option, you could use iptables to redirect port 465 to a one in above 1024 as a workaround.