During the certificate installation I get the following error:
The following errors were reported by the server:
Detail: Failed to connect to XXXXXXX:443 for TLS-SNI-01
challenge: Server only speaks HTTP, not TLS
To fix these errors, please make sure that you did not provide any
invalid information to the client, and try running Certbot again.
I have Ubuntu 15.04 server but I do not think this is the problem because on another server with the same version runs properly.
How can I do?