https://community.cloudera.com/t5/Support-Questions/Docker-sandbox-hdp-hortonworks-com-50070-Connection-refused/m-p/176956#M139206 <P><A rel="user" href="https://community.cloudera.com/users/52155/timroberts.html" nodeid="52155">@Tim Roberts<BR /></A></P><P>Can you please check if you have mistakenly modified your "/etc/hosts' file by any chance? </P><P>Following works for me.</P><PRE>[root@sandbox ~]# cat /etc/hosts 127.0.0.1 localhost ::1 localhost ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters 172.17.0.2 sandbox.hortonworks.com sandbox&lt;br&gt;</PRE><P>.</P><P>FQDN of your Sandbox should be correctly resolvable.</P><PRE>[root@sandbox ~]# hostname -f sandbox.hortonworks.com</PRE><P>.</P><P><A href="https://community.hortonworks.com/questions/148362/service-hdfs-check-failed-2.html" target="_blank">https://community.hortonworks.com/questions/148362/service-hdfs-check-failed-2.html</A></P><P><BR /><A rel="user" href="https://community.cloudera.com/users/52155/timroberts.html" nodeid="52155"></A> </P> Thu, 21 Dec 2017 09:42:20 GMT jsensharma 2017-12-21T09:42:20Z