VBoxHeadless RDP black screen since v4.3

[klim]

Hi,

after the last update to Virtualbox 4.3 i've a problem with the RDP screen which is going black after some time (several hours i think).

Environment:

• Host: Windows Server 2008R2
  VirtualBox 4.3 headless
  Guest: Windows XP incl. newest VirtualBox Guest Additions

I've searched around the net and saw that people had similar problems in older versions of VirtualBox, but i did'nt found a solution for that problem.
When RDP screen is black the virtualmachine is still running correctly.
I also found out, that if i do the following commands, screen is back again, but why that happens?`

VBoxManage.exe controlvm VMName vrde off
VBoxManage.exe controlvm VMName vrde on

Anybody has an idea?

[mattia.burzio]

I experience a similar problem in v4.3 (Host OS: RHEL 5.7)
I use an HP Thin Client to view the Remote Display of a Windows 2008 VM (3D disabled).
If the RDP client doesn't close the session nicely (e.g. I remove power from the Thin Client to simulate a power loss), when I connect again I have a black screen.
If I disable and enable again VRDE on that VM, Remote Display starts to work correctly again.

[noteirak]

try enable multi connections in the VRDE settings of the VM and see if this work better.