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Disabling the autostart of the DHCP Client service (assuming unnecessary if fixed IP addresses are used)
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Disabling the autostart of the "IKE and AuthIP IPsec Keying Modules" service (unnecessary if VPN connections are not made from the computer).
sc config "IKEEXT" start= disabled
Disabling the autostart of the "IPsec Policy Agent" service (unnecessary if VPN connections are not made from the computer).
sc config "PolicyAgent" start= disabled
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