Hi, there is another SSO solution for Drupal 7 and Discourse tested on beta13.
- Download discourse 7.x-1.5 module.
- Install module and dependency (querypath)
- Go to Configuration - System - Discourse:
in my case forum works from folder /forum.
- Set SSO endpoint (/discourse_sso) and secret in Discourse settings:
You may use both discourse sso plugins mentioned above.