Remote desktop connection issue with an RDP client while connecting some 2008 servers and getting "unimplemented type in main loop"

Hi
For the working RDP server console we are getting the below PDU types only.
// PDU Types
RDP_PDU_DEMAND_ACTIVE = 1
RDP_PDU_CONFIRM_ACTIVE = 3
RDP_PDU_DEACTIVATE = 6
RDP_PDU_DATA = 7
Null PDU type = 0
Where as for some windows 2003 servers getting "unimplemented type in main loop 13" instead of above mentioned PDU types.
Could you please provide when we get this other PDU types ?
Thanks & Regards,
Pavan G

Hello Pavan -
I'll help you with this inquiry. By setting minencryptionlevel = 0 on server, are you able to get server->client unencrypted PDUs in network trace ? If yes, please send me the same by dropping a mail to dochelp @ Microsoft dot com.
Thanks.
Tarun Chopra | Escalation Engineer | Open Specifications Support Team

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Hi Team
We have our RDP client and i came across with one issue "Expected data got 3" with this client.
This issue is getting while connecting some of below operating system flavors.
Microsoft Windows 2008 Enterprise edition
Microsoft Windows 2008 Standard edition
Microsoft Windows 2003 servers
When we are trying to get RDP to those servers with our client, getting "Expected data got 3" error. One more main thing here is the specified error is not getting for all the servers of same operating system in above list.
Able to get the RDP console for those servers using mstsc client.
When i read the [MS-RDPBCGR] specification, i found the below points
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Could you please explain me is this issue is happening due to Licence configuration in RDP server and please provide support with server side configuration if any because our code works for other servers ?
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Hello Pavan -
Thanks for contacting Microsoft Support. I'm researching this for you and request you to please send me mail at dochelp @ Microsoft dot com so that I can share tools and techniques to collect some traces and analyze.
Thanks.
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From your description, I also agree that the problem may be in the top RDP client.
1.
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2.
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3.
HP Compaq t5530 Thin Client
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We can try to optimize two ways.
1.
Upgrading Driver – Network for Thin Client
(1) HP Compaq t5510 Thin Client:
http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareIndex.jsp?lang=en&cc=us&prodNameId=420576&prodTypeId=12454&prodSeriesId=420575&swLang=13&taskId=135&swEnvOID=1054
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http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareIndex.jsp?lang=en&cc=us&prodNameId=500833&prodTypeId=12454&prodSeriesId=500832&swLang=13&taskId=135&swEnvOID=2051
(3) HP Compaq t5530 Thin Client
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&objectID=c01087297&prodTypeId=12454&prodSeriesId=3341951
Upgrading RDP to the latest version of HP Web site.
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Remote desktop connection issue with an RDP client while connecting some 2008 servers and getting "unimplemented type in main loop"

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