All our API calls are now failing. Even a simple thing like this:

<username>:<token>@jenkins.goonies3.com/api/json

I keep getting:

Error 401 Unexpected authentication type: org.acegisecurity.providers.UsernamePasswordAuthenticationToken@b69dc627: Username: <username>; Password: [PROTECTED]; Authenticated: false; Details: org.acegisecurity.ui.WebAuthenticationDetails@ffff8868: RemoteIpAddress: <ip address>; SessionId: null; Not granted any authorities

How do I get my API calls working again? This is a huge issue, it's brining most of our automated processing to a halt.