@DataYogi,   IPv4 is a function of your OS networking, so that is a matter for your host and network configuration.  My point is that if you are unfamiliar with how database servers and other servers interact over IPv6, perhaps it would be best to only use IPv4 for now.   See the following postgres information regarding addresses (including IPv6) https://www.postgresql.org/docs/9.3/static/auth-pg-hba-conf.html   It appears you were missing the /64 subnet portion of the IP as your interface shows: inet6 addr: 2402:1f00:8001:281::/64 Scope:Global   I believe either of the following in the pg_hba.conf file would allow access from that one host: host    hue             hue             2402:1f00:8001:281::/64     md5 or host    hue             hue             2402:1f00:8001:281::/128     md5   Unless you need to restrict access, you can add lines to allow access from any host that is IPv6 with the following: host   hue              hue            ::0/0           md5     NOTE:  Make sure you ensure there are no servers connecting to the embedded postgres database and restart from the command line with "service cloudera-scm-server-db restart" after making any changes to ensure they took effect.     ... View more