By default (fresh installation) of Windows Server 2012 R2, I saw that there are several windows firewall rules which contains
Is it ok for us to turn off these firewall rules if we don't use IPv6?
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You should really have IPv6 enabled and firewall on to be honest.
Here's a short article about it. I'm also not sure what you mean by "Don't use it".
Hope this is of some help!