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3CX Certificate File

I use to install 3CX on a bare Debian then switching to the Web wizzard.

The installation process on bare Debian is well described on installing-3cx-pbx-on-debian-10 and just for archive purpose (in case the source website is disabled), I paste the main steps here

wget -O - | apt-key add -
echo "deb buster main" | tee /etc/apt/sources.list.d/3cxpbx.list
dpkg-reconfigure locales

Then absolutely choose en_US.UTF-8

apt update && apt install 3cxpbx

Now we are going to the web Interface and after entering the licence and some other informations:


Not a problem: in fact, you must first generate your server certificate with "certbot". 

Note that "certbot" will need to bind to the port 80 for this to work: temporarily stop "nginx" for that, with:

systemctl stop nginx

You can do it another way, but it is the easiest to me

certbot certonly --standalone -d

Of course, must be an existing DNS record. Create it then run the command, and you have your certificate.

Start  "nginx" back with:

systemctl start nginx

You will have to upload 2 files:

  1. The "cert.pem" file first
  2. The "privkey.pem" file in the next screen

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