If you have a black hole router, that drops packets larger than the Maximum Transmission Unit (MTU) size, when the don't fragment bit is set, use Regedt32 to navigate to:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters
On the Edit menu, Add Value name EnablePMTUBHDetect, as a type REG_SZ. Set the String to 1. If EnablePMTUBHDetect is missing, or set to 0, the default behavior is restored.
NOTE: Setting EnablePMTUBHDetect to 1 causes TCP/IP to disable the don't fragment bit when
several retransmissions go unacknowledged.
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