Getting Error "Unable to get token service url..."

WilliamRice

Server Software:  ArcGIS for Server 10.2.2 on a Windows 2008 R2 machine with IIS 7
Client Software:  Firefox 29.01 on a Windows 7 machine

On a ArcGIS for Server 10.2.2 machine, I have published and configured both public and private map services and enabled Windows Authentication for the private services.  With an ArcGIS Viewer for Flex app (version 3.6), on most of our client machines, the users get prompted for their Windows user name and password, the user is authenticated, and the secured/private services then display correctly in the Flex web app.  On one machine, however, with both Chrome (version 35) and Firefox (version 29.01), when the Flex app accesses the first secured map service, a dialog titled "Map Manager" appears with the following error message: <layer name> layer failed to load:  Fault info:  Unable to get token service url from (http://<server name>/<web adaptor name for private services>/rest/info) Version 10.01+required.

We will during the next couple of days try to isolate if this issue is due to a Windows Profile, etc.  However, since the Windows Authentication works properly for most of our other Windows 7 machines, would anyone have any suggestions about troubleshooting this particular issue.  What does the phrase "Version 10.01+required" refer to?  A particular version of Adobe Flash or something else?  This token service failure occurred with both Firefox and Chrome (IE was not tested at this point because the user preferred to use either of these two browsers).

BjornSvensson

...What does the phrase "Version 10.01+required" refer to?  A particular version of Adobe Flash or something else? 

It refers to the version of ArcGIS for Server.

The IdentityManager in the Flex API requires ArcGIS 10 SP1 for Server or later.
https://developers.arcgis.com/flex/api-reference/index.html?com/esri/ags/components/IdentityManager.html&com/esri/ags/components/class-list.html