How could my clients see the content serve by apache web server in my droplet? The port 80 is not open to internet?
A fierwall consideration…
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If you have terminal access (and a sudo-enabled account) to your server then try typing the following to see if you have a firewall active and what ports are allowed:
sudo ufw show added
if port 80 is open you should see an entry like this:
ufw allow 80
If not then you need to open port 80 by using the following command:
sudo ufw allow http
I would add a few other ports too (for https and SSH)
sudo ufw allow ssh sudo ufw allow 443/tcp
Hope that helps
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