My host is ubuntu 11.04. The guest is WinXP VirtualBox is 4.0.10

The serial port works well with putty in ubuntu.

I setup as: COM1/4/0x3F8/Host Device/ Port Path: /dev/ttyS0

Then I close putty, to make serial port is free. After windows XP and Device Manager started, I see there is a LPT1 instead of COM1 under "Ports(COM & LPT)"

I followed the procedure in this topic( How to access serial ubuntu host serial port on VirtualBox guest OS ), but the issue keeps not resolved.

Thanks for any help.

1 Answer 1


You may suffer from a bug in earlier versions of virtual box:


This issue was fixed from Virtual Box release 4.1.0.

You may succed by simply upgrading to the most recent version (at present 4.1.8).

  • Upgrading to 4.1.8 fixed my issue. Thank you!
    – user45278
    Feb 8, 2012 at 5:09

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