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Client disconnects due to error in the protocol stream (Source TermDD, Event ID 56)

Problem

Sometimes you might receive the following error when remote controlling another client:
The Terminal Server security layer detected an error in the protocol stream and has disconnected the client. Client IP: …

Cause

Error occurs when a client with RDP client below RDP 7 build 6100 connects to any other client for remote control, or even when RDP 7 client remote controls anything under RDP 7. client.

Solution

While searching for a solution I noticed that people suggested to set the network card to auto sense. But what should you do in case you are running Terminal Server as virtual machine in Hyper-V :) . The simple solution, you must upgrade all Remote clients to latest available, as of this text RDP 7 client build 6100. (link).

You can also use Terminal Services Log 3.0 to detect which users are using older RDP Client Versions as shown on figure below. Click here to download trial.

Report showing RDP Client Versions being used

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One Response to “Client disconnects due to error in the protocol stream (Source TermDD, Event ID 56)”

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