SMB over QUIC introduces an alternative to the TCP network transport, providing secure, reliable connectivity to edge file servers over untrusted networks like the Internet. QUIC is an IETF-standardized protocol with many benefits when compared with TCP:
All packets are always encrypted and handshake is authenticated with TLS 1.3
Parallel streams of reliable and unreliable application data
Exchanges application data in the first round trip (0-RTT)
Improved congestion control and loss recovery
Survives a change in the clients IP address or port
SMB over QUIC offers an "SMB VPN" for telecommuters, mobile device users, and high security organizations. The server certificate creates a TLS 1.3-encrypted tunnel over the internet-friendly UDP port 443 instead of the legacy TCP port 445. All SMB traffic, including authentication and authorization within the tunnel is never exposed to the underlying network. SMB behaves normally within the QUIC tunnel, meaning the user experience doesn't change. SMB features like multichannel, signing, compression, continuous availability, directory leasing, and so on, work normally.
A file server administrator must opt in to enabling SMB over QUIC. It isn't on by default and a client can't force a file server to enable SMB over QUIC. Windows SMB clients still use TCP by default and will only attempt SMB over QUIC if the TCP attempt first fails or if intentionally requiring QUIC using NET USE /TRANSPORT:QUIC or New-SmbMapping -TransportType QUIC.
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