Found similar issues but none of them worked for me and my DNS IP is the same as machine public IP where I am trying to install Discourse, still getting this error.
It’s just a warning. If you rebuild the container, does it work?
You also might not be able to access the public IP from the computer itself since (given the hostname) it looks like it’s a NATted IP.
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when I run ./laucher rebuild app. It failed to rebuild. Also could please tell me whats NATted IP and how can I solve it.
Apache is using the ports isn’t it?
Apache is using port 80 i guess i dont know much about it. I was just following these steps https://github.com/discourse/discourse/blob/master/docs/INSTALL-cloud.md
If you have no use for it (might be there by default) you should remove it and then be able to follow the usual steps in the link
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Won’t help for sure 
I have successfully installed discourse but when i am visiting hostname it shows me Apache page instead of Discourse. Any idea what could be going wrong?
I have successfully installed discourse but when i am visiting hostname it shows me Apache page instead of Discourse. Any idea what could be going wrong?
I suggest something like sudo systemctl stop apache2 and sudo systemctl disable apache2 , or even sudo apt remove apache2
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If I am stoping apache an then visiting hostname it throws an error this site can’t be reach.
was it with apache down ? (because i’m not sure it could easily be done with apache holding the 80 port)
i have install apache and edit apache conf to Listen 80 Listen 443 and then restart it and ran ./launcher rebuild app and it installed discourse.
Discourse doesn’t require Apache. Disable or uninstall it, then reboot. At that point Discourse will have access to the necessary ports.
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Thanks, man. I stop apache and ran ./launcher rebuild app and now i can see discourse on my hostname. 
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Make sure Apache is disabled or uninstalled, otherwise the next time your server is rebooted Discourse will be blocked from accessing the port again.
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okay and I am not receiving Activation email I have checked spams also.
Ok, that not related to the above. There are topics dedicated to troubleshooting email.
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