-With network protection, the determination of whether to allow or block access to a site is made after the completion of the [three-way handshake via TCP/IP](/troubleshoot/windows-server/networking/three-way-handshake-via-tcpip). Thus, when a site is blocked by network protection, you might see an action type of `ConnectionSuccess` under [`DeviceNetworkEvents`](/defender-xdr/advanced-hunting-devicenetworkevents-table) in the Microsoft Defender portal, even though the site was blocked. `DeviceNetworkEvents` are reported from the TCP layer, and not from network protection. After the three-way handshake has completed, access to the site is allowed or blocked by network protection.
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