Virtualbox and Serial Port permissions

Posted by Pandincus on Super User See other posts from Super User or by Pandincus
Published on 2009-08-07T19:38:13Z Indexed on 2010/04/26 4:03 UTC
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I have a Windows XP Pro SP3 host machine running a Windows XP Pro SP3 guest machine. The host machine has one serial port, COM1, that I need to use in the guest machine.

When I add the serial port to the guest machine and try to start it, I get the following error:

Failed to start the virtual machine xxx

Cannot open host device 'COM1' for read/write access.
Check the permissions of that device (VERR_ACCESS_DENIED).

Unknown error creating VM (VERR_ACCESS_DENIED).

What are some of the things that might be causing this problem? How can I check "permissions" on a serial port?

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