Hello,
the update to RDP v8.0 with KB2592687 has caused a lot of trouble to get access to RDS servers through RDS Gateway services.
On some clients it is no longer possible to use the RDS Gateway service: After trying to authenticate, the error "The logon attempt failed" is shown immediatly.
After de-installation of the update the problem was gone. Reinstalling caused the same problem again.
It did not matter on which kind of machine the Update is installed (Win7 x86/x64; Server 2008 R2). However, not every client where the update has been installed is affected by the problem.
Kind regards,
Rainer