開啟命令提示字元
進入你安裝virtualbox的目錄;
cd "c:\Program Files\sun\VirtualBox"
執行以下的指令;
VBoxManage setextradata [Ubuntu] "VBoxInternal/Devices/pcnet/0/LUN#0/Config/ssh/Protocol" TCP
VBoxManage setextradata [Ubuntu] "VBoxInternal/Devices/pcnet/0/LUN#0/Config/ssh/GuestPort" 22
VBoxManage setextradata [Ubuntu] "VBoxInternal/Devices/pcnet/0/LUN#0/Config/ssh/HostPort" 3456
比較要注意的是"ubuntu"是你安裝在virtualbox上系統的名稱, 
port3456則看你自己設定;

設定http連線則複製以上指令,ssh改成http即可.
VBoxManage setextradata  [input your vb_name]  "VBoxInternal/Devices/pcnet/0/LUN#0/Config/http/Protocol" TCP 
VBoxManage setextradata  [input your vb_name] "VBoxInternal/Devices/pcnet/0/LUN#0/Config/http/GuestPort" 80 
VBoxManage setextradata  [input your vb_name] "VBoxInternal/Devices/pcnet/0/LUN#0/Config/http/HostPort" 8000

接著重新執行virtualbox即可,第一次設定請重CMD 下指令 直接修改XML可能會失敗詳細原因尚未查明
以上設定或者到目錄下C:\Users\Administrator\.VirtualBox\Machines\Work\ 找該機器的xml  
      <ExtraDataItem name="VBoxInternal/Devices/pcnet/0/LUN#0/Config/ftp/GuestPort" value="21"/>
      <ExtraDataItem name="VBoxInternal/Devices/pcnet/0/LUN#0/Config/ftp/HostPort" value="2121"/>
      <ExtraDataItem name="VBoxInternal/Devices/pcnet/0/LUN#0/Config/ftp/Protocol" value="TCP"/>
      <ExtraDataItem name="VBoxInternal/Devices/pcnet/0/LUN#0/Config/http/GuestPort" value="80"/>
      <ExtraDataItem name="VBoxInternal/Devices/pcnet/0/LUN#0/Config/http/HostPort" value="8000"/>
      <ExtraDataItem name="VBoxInternal/Devices/pcnet/0/LUN#0/Config/http/Protocol" value="TCP"/>
      <ExtraDataItem name="VBoxInternal/Devices/pcnet/0/LUN#0/Config/ssh/GuestPort" value="22"/>
      <ExtraDataItem name="VBoxInternal/Devices/pcnet/0/LUN#0/Config/ssh/HostPort" value="2222"/>
      <ExtraDataItem name="VBoxInternal/Devices/pcnet/0/LUN#0/Config/ssh/Protocol" value="TCP"/>

FTP相關：

How to get PASV FTP to work behind a NAT router with ProFTPD

啟動虛擬機器 XXX 時失敗。

Configuration error: Failed to get the "MAC" value

(VERR_CFGM_VALUE_NOT_FOUND).

Unknown error creating VM (VERR_CFGM_VALUE_NOT_FOUND)

之類的錯誤訊息

VBoxManage setextradata "Ubuntu904" "VBoxInternal/Devices/pcnet/0/LUN#0/Config/guestssh/Protocol" TCP

紅字的地方必須根據你的網卡不同而不同，

Intel PRO… (82540em)，那應該設成e1000

PCnet-FAST (Am79c973)，那就用pcnet

至於你的虛擬網卡會是哪一張呢？就請你自己去你虛擬機器的設定看了～

好像64bits OS預設會配給你e1000；32 bits OS會配給你pcnet