For added Security: Bare minimum ports open?

Hi,

On a Cpanel server with only one user (myself), what would be the bare minimum ports open for the server to function properly?

Of the available ports, the only one I want to leave consciously open is port 80. Regarding WHM, Cpanel and SSH ports, I have special rules to only allow my IP to access them.

With that in mind, what other ports are critical to leave open to the internet?

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I figure these should be open, but not quite sure for some of them:

2089 cp licence tcp outbound
443 https tcp inbound (My only use for Https is for WHM and Cpanel - is this required for secure connections to them?)
113 ident tcp outbound
25 smtp tcp inbound/outbound
37 rdate tcp outbound
43 whois tcp outbound
53 DNS tcp/udp inbound/outbound (I use my hosts nameservers)

Thanks for any input!

 

 

 

 

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