I found a workaround on a technet blog
This will make IE 11 in Windows 10 function with UAG:
- On your UAG server
- open web.config in Program Files\Microsoft Forefront Unified Access Gateway\von\InternalSite
- add following lines of code:
<DetectionExpression Name="Windows10" Expression='UserAgent Contains "windows nt 10.0"' DefaultValue="false" />
< DetectionExpression Name="WindowsNewerThan2000" Expression='UserAgent Contains "windows nt 5.1" OR UserAgent Contains "windows nt 5.2" OR Vista OR Windows7 OR Windows8 OR Windows8_1 OR Windows10' DefaultValue="false"
/>
Origanal Source:
http://blogs.technet.com/b/edgeaccessblog/archive/2015/06/19/rollup-2-for-forefront-unified-access-gateway-2010-service-pack-4-is-available-for-download.aspx
From: Kevin