Pardon, I think I made a mistake. It was supposed to be double "-". So again:

firewall-cmd --permanent --zone=public --add-port=8000/tcp
firewall-cmd --reload

This should be it. Not that last post. My apologies.

Oh and again, it's a CentOS 7 issue.

It appears iptables got replaced with firewall-cmd. This is a working port opener.

firewall-cmd —permanent —zone=public —add-port=8000/tcp
firewall-cmd —reload

Looks like that solved the problem at some level. I'm getting this as results of ajenti-panel

Starting server on (u'0.0.0.0', 8000)
SSL enabled: /etc/ajenti/ajenti.pem
Starting new HTTP connection (1): meta.ajenti.org

I'm sure I've got ways to go, but at least this one is good (still "This webpage is not available". However, you pushed me the right direction. Thanks! If more issues appears, I'll make sure to put it in the right topic.

This is what I'm getting as result:

tcp        0      0 0.0.0.0:8000            0.0.0.0:*               LISTEN      18538/python 

Thanks Eugene for your quick reply. I tried both:

$ sudo netstat -p | grep 8000
$ netstat -p | grep 8000

None of them replied anything. I previously tried 

$ nmap -sT -O localhost

8000/tcp open  http-alt

Is that of any help?

May be an old thread, but I cant seem to find a solution to his either. The netstat replies 

tcp        0      0 0.0.0.0:8000            0.0.0.0:*               LISTEN 

Btw, for those who are looking, I'm on CentOS 7 minimum install. To get netstat to work:

$ sudo yum install net-tools

Did I miss anything? I'm using the latest version as of today (1.2.22.3). I'd hate to start another topic. I'd be making a mess for helpseekers. Apache seems to be running so I should be close. 

Much appreciated in advance!