Twitter API + OAuth: Can't send status updates, getting 401

I don't know what the problem was, but I deleted my Application registration on Twitter (You have to register apps in Twitter to get OAuth keys etc.), and then recreated it. Now it works fine. Weird, probably a problem with Twitter screwing up.

I'm also using Tweetsharp (http://tweetsharp.com/), highly recommend it, it's got a nice fluent API. Note: switching over to Tweetsharp wasn't the fix, I had already switched over and had the same problem until I delete and recreated app registration on Twitter.

If you authorized your application to access your Twitter account when the application was set in "read only access" mode and you get the "Read-only application cannot POST" error after changing the application settings to be "read and write access" then you have to revoke access to the application on https://twitter.com/settings/connections and then reauthorize it. The "read only" access_token tends to be sticky until you revoke it.

• Go to http://www.twitter.com/oauth_clients
• Select your App.
• Edit Application Setting.
• Set Default Access type to Read & Write.
• Save & Run.

Hope this helps.