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Cannot RDP to Client machines

Hi, we are having a problem with accessing client machines, a mix of Vista and Windows 7 Pro machines via RDP over an internal network. All firewall rules and RDP are configured via group policies. Some of the machines work fine, but others do not, so I do not believe this to be policy related.
The machines that are not working generate an error in the logs: "Event ID: 50 TermDD - The RDP protocol component X.224 detected an error in the protocol stream and has disconnected the client". Remote Access is configured for all clients in computer properties but from any other machine we just get a message saying "this computer cannot connect to the remote computer." I have checked for any third party software/firewalls that may be causing this but nothing is on the machines. These are all domain machines on an SBS 2011 platform. These all worked previously on an SBS 2003 platform. The server was a fresh install on new hardware, not a migration and the clients were transferred to the new domain manually.
I have searched around for this error, but cannot find anything specific for Vista that relates to this problem. Any help appreciated.
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icuadmin
Asked:
icuadmin
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1 Solution
 
CherryRubiCommented:
Take a look at: http://support.microsoft.com/kb/951037/en-us - TCP Chimney Offload.
Check your NIC drivers for available updates.

If your Running McAfree look at: https://kc.mcafee.com/corporate/index?page=content&id=KB53784&cat=CORP_EPOLICY_ORCHESTRATOR_4_5&actp=LIST
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icuadminAuthor Commented:
Hi, thanks for the links. We are running Sophos. We don't have McAfee installed at all. I have tried disabling the AV, and updating drivers to no avail.
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AcklesCommented:
Try to remove it completely, sometimes disabling doesn't help.

A
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icuadminAuthor Commented:
I will try that and see if it resolves it.
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icuadminAuthor Commented:
All good thanks!
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