Windows 10: Enable or Disable TCP Fast Open for Microsoft Edge

How to: Enable or Disable TCP Fast Open for Microsoft Edge

How to Enable or Disable TCP Fast Open for Microsoft Edge in Windows 10


Warning This tutorial is no longer valid in Windows 10 build 16299.15.


Information Microsoft Edge is a new web browser that is available across the Windows 10 device family. It is designed for Windows 10 to be faster, safer, and compatible with the modern Web.

TCP Fast Open, TLS False Start, and TLS 1.3 can improve both performance and security in Microsoft Edge.

The first improvement comes from the TLS False Start option, which allows the client to start sending encrypted data immediately after the first TLS roundtrip. With that, we are down to 1-RTT for TLS, or 2-RTT if we count the TCP connection. We have already enabled TLS False Start in Microsoft Edge, with a set of strong cipher suites.

The next improvement comes from the TCP Fast Open procedure, defined in RFC 7413. The RFC defines a new TCP option, containing a “Fast Open Cookie.” When a “Fast Open capable” client connects to a server for the first time, it inserts an empty cookie in the initial TCP SYN message, prompting the server to send back a valid cookie in the response. For the subsequent connections, the client copies the cookie in the TCP SYN message, and then sends data immediately. If the server recognizes the data as valid, it will accept the data and pass them to the application. When TCP Fast Open is enabled, data can be sent before the connection complete, and the responses will arrive immediately. When we combine TCP Fast Open and TLS False Start, the key negotiation is performed simultaneously with the initial TCP handshake. There is just 1-RTT before the HTTP traffic starts.

For more information, see: Building a faster and more secure web with TCP Fast Open, TLS False Start, and TLS 1.3 | Microsoft Edge Dev Blog


This tutorial will show you how to enable or disable TCP Fast Open for a faster and more secure web in Microsoft Edge for your account in Windows 10.



Here's How:

1. Open the Microsoft Edge app.

2. Type about:flags in the address bar, and press Enter. (see screenshot below)

3. Check (enable) or uncheck (disable - default) Enable TCP Fast Open for what you want.

4. Close and reopen Microsoft Edge to apply.







That's it,
Shawn


Related Tutorials

• How to Reset and Change Microsoft Edge about:flags Settings and Features in Windows 10

:)

 

A Faster Web Browser for Windows 10?

Yes, you can always try to use Internet Explorer. However, to enable TCP Fast Open in Microsoft Edge for quicker page load times, kindly follow these steps:

• Open the Edge browse
• Click the "..." button on the upper right corner of your Edge browser.
• At the bottom of the page check that you have EdgeHTML 14.14361 version or higher.
• Click on the address bar and type about:flags and hit Enter.
• Under Networking, click on TCP Fast Open.
• Restart Microsoft Edge.

Looking forward on your reply.

Regards.

 

microsoft edge issue loading commen website after updating to latest creators edition update

I found this on another site and it worked form me.

1) Type about:flags in the Microsoft Edge address bar

2) Scroll down to the Networking section (near the bottom) and uncheck Enable TCP Fast Open

3) Restart the browser