Connections to HTTP, HTTPS or FTP servers on port 10080 will fail. This is a mitigation for the NAT Slipstream 2.0 attack. It helps developers by keeping the web platform safe for users.


Mitigation for the NAT Slipstreaming attack: Preserves user confidence in the web by preventing their browser being used as a vector to attack their internal network.


Specification link

Specification being incubated in a Community Group

Status in Chromium


Enabled by default

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

  • Shipped/Shipping
  • In development
  • Positive



Spec change landed in

Last updated on 2022-01-14