CentOS7 – How to Remove Access to a Port Using Firewall

Had a port opened up to for public use using firewall-cmd, I wanted to limit this port to a specific IP which I found the answer for on this SITE.

I used the following to open it:

$ firewall-cmd --permanent --zone=public --add-port=10050/tcp
$ firewall-cmd --reload

Now using the information from the information I found I wanted to restrict access to this port to a specific IP address. Do I need to first remove this port from public access?

Or Can I just just add the new rule as follows and that will take care of the problem for me?

$ firewall-cmd --new-zone=special
$ firewall-cmd --permanent --zone=special --add-rich-rule='
  rule family="ipv4"
  source address=”123.1.1.1"
  port protocol="tcp" port="10050" accept'

I have tried the following:

$ firewall-cmd --zone=public --remove-port=10050/tcp
$ firewall-cmd --reload

But when I run the following:

$ firewall-cmd --list-ports 

10050/tcp is still displayed.

Please understand I'm not overly familiar with Sever side configurations.

Soultion: Do not forget the –runtime-to-permanent

$ firewall-cmd --zone=public --remove-port=10050/tcp
$ firewall-cmd --runtime-to-permanent
$ firewall-cmd --reload