Yes, the problem is that my hosting works fine.
Is in the clones I've installed in my SYNOLOGY NAS that does not work.
The issue is the following (it seems):
that "NO_BACKSLASH_ESCAPES" mode must be set to ON in the MySQL server configuration.
But to make things worse the SYNOLOGY uses a product called MARIADB 10 that works "over" the MySQL server.
So it seems is in the MARIADB SQL_MODE values WHERE
"NO_BACKSLASH_ESCAPES" HAS TO BE CHANGED TO ON.
As in https://mariadb.com/kb/en/mariadb/sql-mode/
The problem is that I have no interface for MariaDB in the SYNOLOGY NAS.
So I do not know how to access that conf file.
Is there anybody out there with JOOMLAS working on a SYNOLOGY as WebServer?