If you configure the Ethernet TCPWindowSize per interface with a value >=64240, it will use
17520 instead.
To workaround the problem, set the TCPWindowSize globally or use a value <64240.
To set the value of TCPWindowSize globally, use Regedt32 to navigate to:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters
To set it per interface:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\<interface>
Set this REG_DWORD data type to a multiple of 1460, the Ethernet Maximum Segment Size (MSS).
NOTE: TCPWindowSize is the maximum TCP receive window size,
the number of bytes that a sender can transmit without receiving an acknowledgment.