Sorry, no hablo espanol. Try to open the URL https://xxx.xxx.xxx.xxx/owncloud/status.php with your Browser, it should show you a version string of your setup. If your client can't reach it, check if your security products (firewall, antivirus) don't block the connection because it is new or unknown software for them.
No hay ningun sofware antivirus ni firewall que pueda estar boloqueando la conexion con el servidor. EL cliente movil hace la conexion perfectamente con el servidor debe ser algun porblema con la nueva version del cliente para macOS la version anterior no fallaba.
There is no antivirus or firewall software that may be blocking the connection to the server. The mobile client makes the connection perfectly with the server should be some problem with the new version of the client for macOS the previous version did not fail.
You are using an alpha version (development version). It is not considered to be stable, there can still be serious bugs. Please report problems directly to the bugtracker: https://github.com/owncloud/core/issues