Thanks for the answer!
I use Oracle virtual machine and Hirtonworks sandbox 2.2, the problem was the the mode :NAT, I switched on mode Bridge, and it works now
my question now is about the web interface that offer hortonworks; I loaded files into hdfs via Fle browser, and I create tables from filess, browsing data …
but if we want to do a map reduce programme using hortonworks, How I can do it . If you can tell me the steps please 
Last question in a big data context, I think it’s better to have a Linux machine ? , How I can install Hortonworks in this environnement (Linux OS)?
Thanks