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. Note: Always consider performaing a backup or creating a Restore Point before editing the Registry.
1) On the router, disable SPI under Advanced -> Firewall.
2) In Windows 2000/XP/2003, add/change the value DefaultReceiveWindow in HKEY_LOCAL_MACHINE -> SYSTEM -> CurrentControlSet -> Services -> Afd -> Parameters to greater than 65535. You may also want to increase DefaultSendWindow as well.
I recommend matching DefaultReceiveWindow to GlobalMaxTcpWindowSize in HKEY_LOCAL_MACHINE -> SYSTEM -> CurrentControlSet -> Services -> Tcpip -> Parameters.
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