# Interactive desktop: DISPLAY error

**URL:** <https://discourse.openondemand.org/t/interactive-desktop-display-error/152>\
**Category:** Get Help\
**Created:** [January 30, 2019, 1:06am UTC](https://discourse.openondemand.org/t/interactive-desktop-display-error/152 "2019-01-30T01:06:21Z")\
**Posts on this page:** 1\
**Showing post:** 13

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**Author:** ![Mike.Warfe](https://avatars.discourse-cdn.com/v4/letter/m/5e9695/32.png) [@Mike.Warfe](https://discourse.openondemand.org/u/Mike.Warfe)\
**Post date:** [February 11, 2019, 7:18pm UTC](https://discourse.openondemand.org/t/interactive-desktop-display-error/152/13 "2019-02-11T19:18:12Z")

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@emily.dragowsky and I worked on this more today. After doing some troubleshooting we discovered that our CAS implementation was not configured correctly in OOD. Turns out we missed the declaration “CASScope /” in ood\_portal.yml file or our Apache configuration. This sets the scope for which a mod\_auth\_cas cookie is valid. Prior to doing this we would receive a 302 redirect (request for a new CAS cookie) which NoVNC could not understand. Thanks to @pingluo for his post on Yale’s CAS implementation.

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