DRM External Authentication timeout after upgrade

After upgrading DRM, Users are able to login using internal id and password but external authentication times out then check the following.

1. On the DRM Server make sure you have setup CSS.
2. Make sure the you can see the name of the foundation server in the configuration consol.
3. Make sure you can see a process called drm-netjnibridge-host.exe

If everything looks fine but you don't see drm-netjnibridge-host.exe then chances are DRM version on the DRM server and Foundation Server are on different versions. Upgrade DRM instance on the Foundation Server and restart the services on both the systems. Foundation Server first then DRM Server.