ipsec service fails to start and no network

apparently a known issue.  had no network after some windows updates on a windows 2003 VM

in the eventvwr:

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.

The IPSEC Services service terminated with the following error:
The system cannot find the file specified.

  • check if there are any entries in HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSec\Policy\Local
  • if so, delete that subkey
  • then run regsvr32 polstore.dll
  • restart the ipsec service
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