soooo .... hoping for some help here 

 

i am installing a matrix stack on a recycled chomebox which is running ubuntu server using ansible because i thought it would be fun 

 

i set up a proxy-conf or matrix and element in swag so swag should handle the certs - but the ansible script is using letsencrypt and is failing 

 

Failed to obtain a certificate directly (by listening on port 80)
    and also failed to obtain by relying on the server at port 80 to proxy the request.
    See above for details.
    You may wish to set up proxying of /.well-known/acme-challenge to 2402 or,
    more easily, stop the server on port 80 while this playbook runs.

 

thought i'd reach out as i'm kind of brain fried at hte moment

This is a bit late, but you do not need to generate a certificate if you will be running the matrix behind a reverse proxy. In addition, once you setup the DNS properly you will be using port 443.