How to Block QUIC

QUIC (Quick UDP Internet Connections) is a transport layer network protocol developed by Google. Some Google sites, such as YouTube, offer connections via this protocol. QUIC utilizes port 80 and port 443 to potentially bypass transparent proxies, dealing to issues with Web Filtering on Google Chrome.

In order to avoid these issues, you can block or disable quick through the following methods:

1. Block QUIC through Web Filter QUIC controls.

You can easily block QUIC through the Web Filter. Simply navigate to Web Filter > General > QUIC Controls and check the box next to Block QUIC to block all QUIC connections. Remember to Save and Deploy your settings.

2. Disable Experimental QUIC protocol on the Google Chrome browser

1) Open Google Chrome and navigate to chrome://flags. Locate the Experimental QUIC protocol, click the dropdown, and choose Disable. Click Relaunch Now to save your settings.


3. Block QUIC using your Firewall

Configure a firewall policy to block UDP port 80 and UDP port 443. The exact methodology of this step will change based on your particular firewall.

Note: Some Google services, such as Hangouts, default to QUIC protocol and can be blocked by the Web Filter due to its unknown encrypted traffic. By disabling QUIC the protocol is sent over normal TCP ports and can be blocked or allowed as you chose.