Unable to turn on Windows Firewall: Error code 0x6D9

Original Title: Windows7 firewall error 0x6D9 problems

I'm having trouble with my windows firewall, it come up with an error 0x6D9 message when I try to open it. I've tried restarting it and resetting the services settings and such with no luck. Help!


Hi MrWolf26,


·        Do you have any security software installed on your computer?

·        Are you referring to the “Windows Firewall” service when you say “tried restarting it and resetting the services”?


Method 1: Check to see if this is what you have already tried.


a.       Click Start, type "services.msc" (without quotes) and press Enter.

b.      Double-click “Windows Firewall “in the Services list.

c.       On the General tab, next to Startup type, make sure that Automatic is selected.

d.      I f the service is not already running, under Service status, click Start, and then click OK. 


Method 2: Temporarily disable the computer`s anti-virus program and check if the issue persists. If no issue occurs, then you might need to firewall settings within the security software.


Note:  Ensure to enable your anti-virus back on the computer after you finish these steps. It is not recommended to disable these settings on the computer. This is just to troubleshoot the issue.

Disable antivirus software


Method 3: If this does not help, then go ahead with the following steps and check for the issue.


a.       Click Start and type “cmd” (without quotes) in the start search box.

b.      From the programs list right click on cmd and select “Run as Administrator.”

c.       In the command shell type the following command and press Enter after each command.


netsh advfirewall reset
net start mpsdrv
net start bfe
net start mpssvc
regsvr32 firewallapi.dll


d.      Confirm any box that comes up by clicking OK. The result on the last entry should say that it succeeded.


Hope this helps!


Syed N – Microsoft Support
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Question Info

Last updated October 12, 2020 Views 6,705 Applies to: