VERR_VRDP_PROTOCOL_ERROR when using an old version of french winxp RDP client

[jerome]

Hello. Maybe this is the same bug as #813? I am using Vbox 1.5.2 on linux host rdesktop works ok from linux RDP client At this time VM are unusable from Win clients... If it is fixed is next release, can you provide a working binary please ? I tried the svn tree but unfortunately VRDP is not included

Do you have some workaround at this time (some other winXP client that would work ?) Thanks Jerome

[Sander van Leeuwen]

Can you retry with 1.5.4?

[jerome]

Hi thanks for the update The problem still occurs with 1.5.4 Regards Jerome

[Denis Angilella]

This bug still exists in vbox 1.5.7, see attached file.

It happens with Windows XP SP2 RDP Client.

Do you know a workaround?

[Denis Angilella]

Maybe it can help, RDP client is Microsoft mstsc.exe version 5.1.2600.2180

[Denis Angilella]

Same problem with mstsc.exe version 5.2.3790.0 (Windows 2000)

[jerome]

Yes the last version is still buggy & unusable... Innotek staff: have you identified the problem btw ? This is the workaround i use (some users are on windows, you can't do nothing about it ;-)

-disable VRDP on the VM (must shut it down first)

-enable remote desktop access on the guest VM

-shut down the VM

-Set up a port forwarding to the default RDP 3389 with the following command:

assuming your vm is called 'winxp':

VBoxManage setextradata "winxp" "VBoxInternal/Devices/pcnet/0/LUN#0/Config/rdp_fw/Protocol" TCP

VBoxManage setextradata "winxp" "VBoxInternal/Devices/pcnet/0/LUN#0/Config/rdp_fw/GuestPort" 3389

VBoxManage setextradata "winxp" "VBoxInternal/Devices/pcnet/0/LUN#0/Config/rdp_fw/HostPort" 33389

restart your VM

Now you should be able to connect on port 33389 with any winxp client...

[sunlover]

Hello dangi, thanks for the VBox.log file. We will take a look.

[sunlover]

Hello freejazz, the problem that you've reported is different from what dangi has. In your log the RDP packet is not even decrypted, while in dangi's one it is decrypted.

Can you please make a new log with the 1.5.6? Make sure you connect to the VRDP server rather than the guest WinXP RDP.

Thanks!

[sunlover]

dangi, do you use a MS RDP Client version which does not support encryption? Like one included in a French version of Windows?

[Denis Angilella]

Yes, I use a french version of Windows. Oh my god, it means that communication is not encrypted?!

[sunlover]

AFAIK, the french version of the client does not use encryption. Could you try with the en_us client? Take it from the Microsoft site.

[jerome]

Update: i am also testing with french XP version. I'll run a test with the en_US client (if it is available for dl ?) I'll keep you posted. Regards

[Denis Angilella]

I installed "Remote Desktop Connection (Terminal Services Client 6.0) for Windows XP (KB925876)" in french language from Microsoft Web site and now it works!

I also tested on Windows 2003 server english, with mstsc.exe version 5.2.3790.3959, it works.

[jerome]

I also tested KB925876 (french). Note: English version isn't installable on french XP.

I confim that it solves the problem.

Additional notes:

-Only null auth. scheme seems usable. Trying "external" leads to error msgs in the log:

00:01:15.499 VRDPAUTH: ConsoleVRDPServer::Authenticate: loading external authentication library 'VRDPAuth' 00:01:15.515 VRDPAUTH: Could not resolve import 'VRDPAuth2'. Error code: VERR_SYMBOL_NOT_FOUND 00:01:15.515 VRDPAUTH: Using entry point 'VRDPAuth'. 00:01:15.516 VRDPAUTH: external authentication module returned 'access denied' 00:01:15.516 VRDPAUTH: Access denied.

-same resolution must be configured on client/VM sides unless display strangely blinks (switch between the 2 res.?). Very strange...
Thanks for your help anyway.

Jerome

[sunlover]

Jerome,

the username/password which you use with auth external must be valid on the VRDP server system. The VRDPAuth module uses PAM to authenticate the user, 'login' PAM service name is used. The 'access denied' error is most likely a PAM misconfiguration. The VRDPAuth module can produce a debug output. To enable it do: export VRDP_AUTH_DEBUG_FILENAME=/full/path/to/logfile and run the VM with the env var. Then try to connect with the RDP client and take a look in the logile.

About this blinking, have you installed the latest (1.5.6) guest additions to the VM?