I have imported an existing machine on a freshly installed VirtualBox 4.1.6r74727, running on a Ubuntu Server 10.04 box. The guest OS is Windows Server 2003.
Further, I have modified the VM as follows (10.20.30.40 represents the real publc IPv4 address of the host machine):
VBoxManage modifyvm "2003" --vrdeaddress 10.20.30.40 --vrde on --vrdeport 3389 --vrdemulticon on --vrdeauthtype external
After that, I started the VM with the following:
VBoxManage startvm "2003" --type headless --vrde=on
When I issue
VBoxManage showvminfo "2003", I get the following:
VRDE: enabled (Address 10.20.30.40, Ports 3389, MultiConn: on, ReuseSingleConn: off, Authentication type: external) Video redirection: disabled
However, port 3389 stays closed both on 10.20.30.40, and on localhost and I cannot connect to VRDE. What is the reason and how should I approach fixing it?