using mstsc activex control, there is a phenomenon in which the loss of information during the connection string in the domain of PC, which is Join to Active Directory.

Hello.
I have created an RDP-control based on this article:
http://www.codeproject.com/Articles/43705/Remote-Desktop-using-C-NET

By applying this code, I've created a remote desktop client.

To when connecting to PC that you use this client, has been Join to Active Directory

Part of the string information of domain are lost.

We have to ensure that the string of the domain that was set up just before the connection is normal during debugging.
However, after the connection, because the domain part of the string had been cut
Error comes out suppose that you have entered the information account that was in error during connect to the PC.

Environment OS that were tried are, is the Windows7 Ultimate 64Bit.

I I think with the you want to know which either from the factor.
I want to know a solution if possible.