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Event ID: 20499 Source: Microsoft-Windows-TerminalServices-RemoteConnectio

Level
Description
Remote Desktop Services has taken too long to load the user configuration from server <FQDN of a domain controller> for user <username>.
Comments
 
I experienced the same issue and resolved it by adjusting the registry as follows:
Open RegEdit on the Windows Server machine.
Navigate to this registry key in the tree on the left:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
Right-click on the right side and add a new DWORD (32-bit) Value
Set the value name to DisableTaskOffload and the value data to 1
Reconnect to the Server via RDP (to a new session) and your performance should be normal.

See also EV100551 (Remote Desktop Services has taken too long to load).

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