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I downloaded and installed these virtual machines for IE8/IE9 web development, IE9 stays running but it appears the IE8 VM is constantly shutting itself down, and it is saving the state (it doesn't boot fresh) so I think it is Vbox. How can I debug what is causing this specific VM to shutdown. It is stable when I use it and only happens when I am not watching it, it never happens when I am using the VM.

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These test VMs are typically unlicensed copies of Windows and the anti-piracy measures in Windows will reboot your machine every few hours. Could this be what is happening? –  heavyd Sep 25 '12 at 14:38
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The machine can be set to hibernate after some idle time? –  laurent Sep 25 '12 at 14:44
    
These are not unlicensed copies, they are legitimate versions that just never get registered and are legal. The machine isn't rebooting, since the state is being saved. I will check into hibernation. –  Elijah Lynn Sep 26 '12 at 2:20
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1 Answer

heavyd is right.

https://github.com/xdissent/ievms/issues/22

In the Windows guest, open the command prompt and enter

slmgr /rearm

(not --rearm as cited in that post, since this is Windows). You can do that up to twice apparently, to extend by 30 days each time. Apparently the iectrl tool from ievms also works but I didn't try that.

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