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In the sender.pcapng file, it's clear that for some reason is incapable of processing the incoming data. Look at frame 171 and forwards, there you'll see that announces a TCP Receive Window of zero bytes i.e. he's telling the sender that he cannot transmit anymore data. That coupled with packet loss will result in very poor transfer rates. Apart from that, a Receive Window of only 128K is not nearly enough to fill the circuit in order to get the maximum transfer rate. I'd look into the various settings on Windows 2008 that could prohibit it from scaling higher than 128K. Not sure, but maybe this can lead you in the right direction: