QUIC protocol and Web Protection

  • May 29, 2024
  • min read

Understanding the QUIC Protocol and Web Protection


QUIC (Quick UDP Internet Connections) is a recent internet protocol designed to make your web browsing faster and more secure. Developed by Google, it is now enabled by default in Chrome and other Chrome-based browsers. QUIC is closely tied to HTTP/3, the latest version of the HTTP protocol used by websites. Any website using HTTP/3 relies on QUIC to deliver content swiftly and securely.

Key Features of QUIC

How QUIC Works

QUIC works over UDP (User Datagram Protocol), which is different from the traditional TCP (Transmission Control Protocol) used by most internet traffic. This difference allows QUIC to establish connections faster and handle network changes more efficiently.

Implications for Firewalls and Network Security

One significant aspect of QUIC is its impact on firewalls and other network security tools:

Firewall Limitations

Traditional firewall software can’t block specific sites using the QUIC protocol. While they can block the entire QUIC protocol, they can’t target individual websites that use it.

Encrypted Traffic

QUIC traffic is encrypted, making it impossible to look inside the packets to identify specific URLs or domains. This means firewalls can’t filter traffic based on domain patterns as they might with older protocols. Due to these reasons, Emsisoft Web Protection cannot look into QUIC traffic to block hosts, since that would require breaking the encryption chain for users. Given these challenges, you will not be able to set exclusions or custom host rules in your Web Protection section for websites using the HTTP/3 protocol.
Instead, our browser extension Emsisoft Browser Security is protocol independent so it still works with websites that are served via QUIC.


The QUIC protocol represents a significant advancement in web technology, offering faster and more secure connections. However, it also presents new challenges for network security and firewall configurations. Understanding these implications can help you make informed decisions about your internet security and privacy.

If you have any concerns or need further assistance, please do not hesitate to reach out to our support team via email at [email protected] or check our Help Pages here.

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