Setup certbot SSL for wikijs installation error: Could not bind TCP port 80 because it is already in use by another process

I am attempting to use certbot to add SSL encryption to my wiki js installation. My droplet is on and I am logged into the remote shell. After running: ‘certbot certonly --standalone’ and entering my domains, I get this error:

Could not bind TCP port 80 because it is already in use by another process on this system (such as a web server). Please stop the program in question and then try again.

• The activity monitor (on my mac) is not showing any processes on port 80.

• I had nginx installed (on my mac), but uninstalled it using brew (not using it)

• I use pm2 (on my mac)to start up a local node.js server, but all stopped these processes

• I am not sure what process might be blocking port 80.

Further, I am not sure if the warning is about some process in my droplet using port 80 or my MacBook??? When I list active ports in my droplet, I see two instances of ‘docker-pr’ listening on port 80. Could this be an issue?

Following the certbot documentation, I tried using --webroot instead of --standalone (‘certbot certonly --webroot’). The issue here so far is that I don’t know how to specify the webroot location. I’ve dug through the directories but don’t see where this path is.

My confusion is that I am supposing the droplet server is using port 80. I need to be logged in to the server to run certbot. I can’t run certbort if my droplet is off.

Thanks!