Problem using WTSOpenServer on Win2003Server DC

[Christopher Attard]

Hi,
I'm using WTSOpenServer (P/Invoke in a C# application) to open a
handle to a specified terminal server which is Win2003 Server Domain
Controller.

The function is returning NULL (or 0). I'm able to connect
successfully to the terminal server when using the remote desktop program
from a WinXP client machine.

Any ideas or suggestions pls?

Regards,
Chris Attard

[Mattias Sjögren]

> Any ideas or suggestions pls?

Ensure that you have SetLastError=true in your DllImport attribute,
then call Marshal.GetLastWin32Error() after the call to
WTSOpenServer() to get an idea about why its failing.

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
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[Christopher Attard]

Yes, I'm already dong it....The error returned is: 5

"Mattias Sjögren" <ma********************@mvps.org> wrote in message
news:uV**************@TK2MSFTNGP11.phx.gbl...

Any ideas or suggestions pls?

Ensure that you have SetLastError=true in your DllImport attribute,
then call Marshal.GetLastWin32Error() after the call to
WTSOpenServer() to get an idea about why its failing.

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

[Willy Denoyette [MVP]]

Which means "access denied".
You have to impersonate using a privileged account's credentials (like a
domain admins, or enterprise admins account).

Willy.
"Christopher Attard" <ch*********@gfi.com> wrote in message
news:e3**************@TK2MSFTNGP15.phx.gbl...

Yes, I'm already dong it....The error returned is: 5

"Mattias Sjögren" <ma********************@mvps.org> wrote in message
news:uV**************@TK2MSFTNGP11.phx.gbl...

Any ideas or suggestions pls?

Ensure that you have SetLastError=true in your DllImport attribute,
then call Marshal.GetLastWin32Error() after the call to
WTSOpenServer() to get an idea about why its failing.

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

[Christopher Attard]

I'm using the Administrator account which is a member of the Domain Admins
and still it's returning an error of 5. What seems awkward is that when I'm
using the same account to connect to the same server through mstsc.exe, its
creating a successful terminal session.

Chris

"Willy Denoyette [MVP]" <wi*************@pandora.be> wrote in message
news:eX**************@tk2msftngp13.phx.gbl...

Which means "access denied".
You have to impersonate using a privileged account's credentials (like a
domain admins, or enterprise admins account).

Willy.
"Christopher Attard" <ch*********@gfi.com> wrote in message
news:e3**************@TK2MSFTNGP15.phx.gbl...

Yes, I'm already dong it....The error returned is: 5

"Mattias Sjögren" <ma********************@mvps.org> wrote in message
news:uV**************@TK2MSFTNGP11.phx.gbl...

Any ideas or suggestions pls?

Ensure that you have SetLastError=true in your DllImport attribute,
then call Marshal.GetLastWin32Error() after the call to
WTSOpenServer() to get an idea about why its failing.

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

[Willy Denoyette [MVP]]

Should work, try using a DC administrator account.
- check the eventlog (turn on auditing).
- check your accounts privileges.

Willy.

"Christopher Attard" <ch*********@gfi.com> wrote in message
news:ez**************@TK2MSFTNGP15.phx.gbl...

I'm using the Administrator account which is a member of the Domain Admins
and still it's returning an error of 5. What seems awkward is that when
I'm using the same account to connect to the same server through
mstsc.exe, its creating a successful terminal session.

Chris

"Willy Denoyette [MVP]" <wi*************@pandora.be> wrote in message
news:eX**************@tk2msftngp13.phx.gbl...

Which means "access denied".
You have to impersonate using a privileged account's credentials (like a
domain admins, or enterprise admins account).

Willy.
"Christopher Attard" <ch*********@gfi.com> wrote in message
news:e3**************@TK2MSFTNGP15.phx.gbl...

Yes, I'm already dong it....The error returned is: 5

"Mattias Sjögren" <ma********************@mvps.org> wrote in message
news:uV**************@TK2MSFTNGP11.phx.gbl...
> Any ideas or suggestions pls?

Ensure that you have SetLastError=true in your DllImport attribute,
then call Marshal.GetLastWin32Error() after the call to
WTSOpenServer() to get an idea about why its failing.

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

[Christopher Attard]

Thanks Willy...problem solved. Infact i was running the call in the security
context of a non-administrative account.

Chris

"Willy Denoyette [MVP]" <wi*************@pandora.be> wrote in message
news:eS**************@TK2MSFTNGP14.phx.gbl...

Should work, try using a DC administrator account.
- check the eventlog (turn on auditing).
- check your accounts privileges.

Willy.

"Christopher Attard" <ch*********@gfi.com> wrote in message
news:ez**************@TK2MSFTNGP15.phx.gbl...

I'm using the Administrator account which is a member of the Domain
Admins and still it's returning an error of 5. What seems awkward is that
when I'm using the same account to connect to the same server through
mstsc.exe, its creating a successful terminal session.

Chris

"Willy Denoyette [MVP]" <wi*************@pandora.be> wrote in message
news:eX**************@tk2msftngp13.phx.gbl...

Which means "access denied".
You have to impersonate using a privileged account's credentials (like a
domain admins, or enterprise admins account).

Willy.
"Christopher Attard" <ch*********@gfi.com> wrote in message
news:e3**************@TK2MSFTNGP15.phx.gbl...
Yes, I'm already dong it....The error returned is: 5

"Mattias Sjögren" <ma********************@mvps.org> wrote in message
news:uV**************@TK2MSFTNGP11.phx.gbl...
>> Any ideas or suggestions pls?
>
> Ensure that you have SetLastError=true in your DllImport attribute,
> then call Marshal.GetLastWin32Error() after the call to
> WTSOpenServer() to get an idea about why its failing.
>
>
>
> Mattias
>
> --
> Mattias Sjögren [MVP] mattias @ mvps.org
> http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
> Please reply only to the newsgroup.