Can not connect to server through HTTP in port 80 but can connect through HTTP in port 443

[dfialho]

I have executed the command: docker run --name oc -p 80:80 -p 443:443 -d l3iggs/owncloud as indicated in the Usage tutorial.

I am able to connect to the server with https://localhost/owncloud, but when I try to use HTTP using the URL http://localhost/owncloud I can not connect to the server. This is specially troubling since let's encrypt is not able to access the server in port 80 during the certificate fetching process to verify ownership of the domain.

[greyltc]

A few points here:
A) I've disabled serving up the owncloud server through an unencrypted connection by default. Why would you want to do that anyway?
B) let's encrypt does not visit http://localhost/owncloud verify ownership of your domain. It visits http://yourdomain.tld You can see this site (which should appear empty) by pointing your browser to http://localhost