https://community.cloudera.com/t5/Support-Questions/Cannot-access-Nifi-Web-UI-after-set-nifi-web-http-host/m-p/234209#M196029 <P><A rel="user" href="https://community.cloudera.com/users/112446/htluandc.html">@luan ha</A><BR /><BR />Are you sure that "lunc-ht01" is your Public Hostname (OR) Private hostname ?</P><P>Is that public hostname "lunc-ht01" mapped with IP Address "107.113.193.160" ?<BR /><BR />On the Nifi Host can you please try running the following command and share the output.</P><PRE># curl -s <A href="http://169.254.169.254/latest/meta-data/public-hostname" target="_blank">http://169.254.169.254/latest/meta-data/public-hostname</A> -o /tmp/public-hostname.txt &nbsp;; cat /tmp/public-hostname.txt&nbsp; # cat &nbsp;/etc/hosts # hostname -f # netstat -tnlpa | grep 8080</PRE><P>.</P><P>Can you check your Local machine where you are opening the web browser to verify your "/etc/hosts" file to see if it is pointing to the Private IP Address of "lunc-ht01" ? On your Local machine where you are opening the browser.</P><PRE># cat /etc/hosts # telnet 107.113.193.160 8080 (OR) # nc -v 107.113.193.160 &nbsp;8080</PRE><P>.</P><P><BR /></P><P><BR /></P> Sat, 29 Jun 2019 21:54:38 GMT jsensharma 2019-06-29T21:54:38Z