After upgrading from 1.6 to 1.7.3 your unable to access the DC/OS UI



After upgrading from 1.6 to 1.7.3 you are not able to launch DC/OS UI


Steps taken to resolve


systemctl list-units| grep dcos

you may see a problem with "dcos-gunicorn-bouncer.service" it is not getting started.

It appears as 

jdcos-gunicorn-bouncer.service       loaded     activating


You see an error in the journalctl log

Process: 12547 ExecStart=/opt/mesosphere/packages/bouncer--415369472893c05b041e9003ee9b672cfc12a70e/bouncer/bin/ (code=exited, status=2'''


Reviewing the bouncer json,


 & using a jsonlint, here showed it was invalid.


We figured out that the bouncer-config.json was formatted incorrectly due to a typo in the creation of the DC/OS 1.8 config.yaml


should have been 


Reference: Section: "Create configuration file"


The DC/OS UI became available after executing 

sed 's/True/true/g' /opt/mesosphere/etc/bouncer-config.json

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