I have a Debian Wheezy VM running in virtual box with the 1st adapter being NAT. However I want to also add a Host-only network but I can't add 2nd adapter to network for VM, it is grayed out.
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If the VM is not running, and is in a saved state, you need to start it, then from the VirtualBox Manager, right click and select Close > Power off. You can't add a network adapter in the saved state.
Also, if required, remember to setup your proxy details in VirtualBox Manager. Power on the VM, then setup proxy details for IE.