With the upgrade to rails 6, when using the qa tunnel for Auto DevOps on gdk it is required that the host address of the development environment is whitelisted via `config.hosts` If this is not set you will be served a `Blocked host Error` As a current workaround you can add a line to `<path_to_gdk>/gitlab/config/environments/development.rb`: ``` config.hosts << "[PORT].qa-tunnel.gitlab.info" ``` but this should be automated as part of the setup when you [run gdk reconfigure with autodevops enabled](https://gitlab.com/gitlab-org/gitlab-development-kit/blob/master/doc/howto/auto_devops.md#setup) as a gitlab employee.