| 1 | <?xml version='1.0' encoding='UTF-8'?>
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| 2 | <!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
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| 3 | <topic xml:lang="en-us" id="ts_win-host-com-server">
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| 4 | <title>VBoxSVC Out-of-Process COM Server Issues</title>
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| 5 |
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| 6 | <body>
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| 7 | <p>
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| 8 | Oracle VM VirtualBox makes use of the Microsoft Component Object Model
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| 9 | (COM) for interprocess and intraprocess communication. This
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| 10 | enables Oracle VM VirtualBox to share a common configuration among
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| 11 | different virtual machine processes and provide several user
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| 12 | interface options based on a common architecture. All global
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| 13 | status information and configuration is maintained by the
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| 14 | process <filepath>VBoxSVC.exe</filepath>, which is an
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| 15 | out-of-process COM server. Whenever an Oracle VM VirtualBox process is
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| 16 | started, it requests access to the COM server and Windows
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| 17 | automatically starts the process. Note that it should never be
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| 18 | started by the end user.
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| 19 | </p>
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| 20 | <p>
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| 21 | When the last process disconnects from the COM server, it will
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| 22 | terminate itself after some seconds. The Oracle VM VirtualBox
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| 23 | configuration XML files are maintained and owned by the COM
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| 24 | server and the files are locked whenever the server runs.
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| 25 | </p>
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| 26 | <p>
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| 27 | In some cases, such as when a virtual machine is terminated
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| 28 | unexpectedly, the COM server will not notice that the client is
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| 29 | disconnected and stay active for a longer period of 10 minutes
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| 30 | or so, keeping the configuration files locked. In other rare
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| 31 | cases the COM server might experience an internal error and
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| 32 | subsequently other processes fail to initialize it. In these
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| 33 | situations, it is recommended to use the Windows task manager to
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| 34 | kill the process <filepath>VBoxSVC.exe</filepath>.
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| 35 | </p>
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| 36 | </body>
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| 37 |
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| 38 | </topic>
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