The Wayback Machine - https://web.archive.org/web/20140716023437/https://dev.twitter.com/issues/1702

Issue #1702: Getting 401 no matter what I do

Tried with my own API implementation using POST Statuses Update => 401
Tried with a few third part integration => 401
Has been working 5 days ago.
Created new App on Twitter just in case..permissions are all set correctly... problem stays....