Login into server through SSH using a Terminal or Putty.
Open the csf configuration file:
and add the port number ,which you mean to open in server
# Allow incoming TCP ports
TCP_IN = 21,22,25,54,81,113,143,473,965,187,393,991,261
# Allow outgoing TCP ports
CSF then needs to be restarted for the change to take effect:
Not at all
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