@scottalanmiller Hello ! Sorry i don't see directly the post.
I'm Mika from France 
I work for a network operator. 2 years experiences in Network administration and Sysadmn Windows but since a year i turned to Admin Linux :smiling_face_with_halo: :smiling_face_with_halo:
I have to learn much more in Admn Linux 
Yes sorry i know with dns and port :upside-down_face: but it's because my bad English who create confusion. :pensive_face: i make a bad describe
Aha it's fine now :smiling_face_with_open_mouth_smiling_eyes:
I've make a new instalation FROM SCRATCH :upside-down_face: . I've take the last iso from centOS 7.3 minimal.
I have try a newer node.js version(v8.10.0)
For requirement :
Install git :
sudo yum groupinstall "Development Tools"
sudo yum install gettext-devel openssl-devel perl-CPAN perl-devel zlib-devel
cd /opt/
wget https://github.com/git/git/archive/v2.16.2.tar.gz
tar -zxf v2.16.2.tar.gz
cd git-2.16.2/
make configure
./configure --prefix=/usr/local
sudo make install
git --version
Install mongodb :
vim /etc/yum.repos.d/mongodb-org-3.6.repo
sudo yum install -y mongodb-org
semanage port -a -t mongod_port_t -p tcp 27017
systemctl enable mongod
systemctl start mongod
mongod --version
Install NodeJs :
curl --silent --location https://rpm.nodesource.com/setup_8.x | sudo bash -
yum install -y nodejs
sudo yum install gcc-c++ make
node --version
I have let the default port (80) and create
Now it's work fine !
I will try with a web server in frontal now (nginx)
Thanks for help and patience :smiling_face_with_open_mouth_cold_sweat: