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Windows advanced firewall outgoing rule

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#1 sk8erbender


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Posted 20 July 2018 - 01:42 AM

Hey guys! As far as I understand to allow windows update when blocking all outgoing ports is to give svchost.exe 443 tcp. ?


I have a question how to allow windows update time from time.nist.gov ?

I know if I create rule outgoing UDP 123  it works. But how can I make outgoing udp only for windows time update program ?

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#2 sk8erbender

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Posted 20 July 2018 - 02:19 AM

Well I made rule like this now

Server time-a-g.nist.gov


Firewall Rule -

Remote IP Address section, select the These IP Addresses: radio button, then click the Add... button.

In the IP Address window, enter the IP scope :

I entered scope


seems to be safer now.


#3 tos226



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Posted 26 July 2018 - 11:24 AM

There are more addresses you'll need to enter if that's the route you like to take. See


In your rule you might want to add W32Time service so that only it can do UDP from/to port 123. I know there's a way to add specific service in Microsoft's firewall but since I don't use it, I don't recall the exact steps.

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