IBM Docs 2.0 CR2 viewer and Connections 6 not working

I installed Connections 6.0 and then Docs 2.0 CR2.
When I tried to preview a file I got an error saying that the viewer service is not running.

The excellent Martti Garden, the Docs guru, has found a solution for that, see here
http://socialibmer.com/ibm-docs-viewer-not-working-with-ibm-connections-6-0-with-error-clfaf401w-clfaf400w/