did some more debugging, with our own client, we can make it to work well. But 
as a plugin to microsoft rdp client, it's not consistent, sometimes, usb 
devices appear, sometimes not.
 
It seems to do with the time vrdp server starts to send out messages. MS plugin 
API  receives messages after rdp connection is fully established. So can you 
investigate the server side, to start sending out messages after connection is 
complete. 
 
Right now, we noticed that our client receives messages from rspsnd and vrdpusb 
channels during connection time. In our client, we can fix this. However, with 
MS plugin, we don't have a way to hook so early.

--- On Tue, 2/7/12, Klaus Espenlaub <[email protected]> wrote:


From: Klaus Espenlaub <[email protected]>
Subject: Re: [vbox-dev] any plan to support RDP usb redirection spec?
To: [email protected]
Date: Tuesday, February 7, 2012, 2:47 AM


On 06.02.2012 22:48, Huihong Luo wrote:
> Microsoft has published a spec:
> http://msdn.microsoft.com/en-us/library/ff635589/
> for usb redirection from rdp client to Hyper-V virtual machines through
> a channel extension. similar to vbox's current vrdp usb protocol. From
> my implementation of vrdp usb client, it seems not that stable. So I
> wonder if microsoft's spec is better.

Not immediately, especially as a spec by itself doesn't fix problems. Is 
your implementation available anywhere? We could potentially help, as 
the VirtualBox USB redirection is quite stable as such on the platforms 
where we have RDP client support for it.

Klaus

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