Update: There is also a hotfix – Fix474567
Here is the solution:
(two options)
Option1 (Group Policy):
- Local Computer Policy
- Computer Configuration
- Administrative Templates
- Windows Components
- Remote Desktop Services
- Remote Desktop Connection Client
- Turn Off UDP On Client –> Enabled
Option 2 (Regedit):
HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services\Client\
Create a dword and assign a value of 1 to: tofClientDisableUDP dword:00000001
Source: Really long thread at http://social.technet.microsoft.com/Forums/windows/en-US/9fd4d6d5-1adc-494d-a916-0032f3e08789/remote-desktop-client-on-windows-8-drop-connection?forum=w8itpronetworking