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No network connection in Windows.

  • Parallels Desktop 8 for Mac Standard Edition


  1. No network connection in Windows Virtual Machine.
  2. If you go to Command Prompt (Go to Start > type cmd in Search field > press Enter) and run "ping" command, you will see all ping requests get "Destination host unreachable" replies.

  3. During the boot process, the following event gets into the System log (Go to Start > type Event Viewer in Search field > Event Viewer (Local) > Windows logs > System):

    The IPSec driver has entered Block mode. IPSec will discard all inbound and outbound TCP/IP network traffic that is not permitted by boot-time IPSec Policy exemptions. User Action: To restore full unsecured TCP/IP connectivity, disable the IPSec services, and then restart the computer.


IPSec driver is broken on the Windows Virtual Machine.


  1. Restart the virtual machine and take a Snapshot in order to create a safe backup:
    • start Parallels Desktop 9 and the Virtual Machine;
    • in the menu bar at the top go to Virtual machine > Take a snapshot.
  2. Open Start menu, in Search bar type regedit and press Enter to open Registry Editor.
  3. Click on File menu > Save As and save it in a safe location in Windows guest OS.
  4. Go to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSec\Policy\Local. Delete "Local" folder if it exists.
  5. Go to Command Prompt: Start > type cmd in Search field > press Enter.
  6. Execute the following command to recreate IPSec policies from scratch:

    regsvr32 polstore.dll

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