OK. I cannot reach that URL. I get the same "Connection Refused" which means something is not allowing that request to reach the certbot standalone server.
If you try that URL, does it work for you?
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And, what does this show while the standalone is paused:
sudo netstat -pant | grep -i listen | grep 80
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I stopped the application running on tomcat. Should I restart it?
The certbot standalone server should show as listening on port 80 while it is paused. I don't have any ideas why it would not show up. Sorry. Makes no sense to me.
You should be seeing something like this. It is a python script so that is the name
tcp6 0 0 :::80 :::* LISTEN 9320/python3
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That may require using a second SSH connection.
[so that you don't stop the certbot command]
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