Proxy 407 issue [October 2021]

I cannot open Zwift on my PC : remote server returned an error (407) Proxy authentication required. If problem persists call Zwift support
Any one got any ideas

Hi @Barry_Thomas welcome to Zwift forums.

Shuji at Zwift HQ here. Checked your logs on our server and noticed your most recent login from the Windows machine in mid-September used a very out of date build of the game app.

We upgraded some of our server capabilities last week that are known to create problems for players using outdated game clients. Please update Zwfit on your PC and let us know if that clears it up?