Thanks for your comment. I just solved the problem after 2 days of struggling. There reason was the proxy settings set on my machine by the company I work for. I just added 'sandbox.hortonworks.com' domain name to the proxy bypass list. Also, in order to make webhdfs connection to sandbox from another CentOS VM I added 'sandbox.hortonworks.com' to no_proxy variable at /etc/bashrc of the CentOS and it worked! Thanks 🙂 ... View more