Its a Twitter login. My boss had me rebuild the whole system. We are running a security check on all servers now. It looks similar to a phishing scam, but we are making sure no one has broken through the firewall.
Its some sort of Twitter API. I don't have a Twitter account, so I don't understand why this is happening.
The server twitter.com at Twitter API requires a username and password.
Warning: This server is requesting that your username and password be sent in an insecure manner (basic authentication without a secure connection)
The problem seemed to have gone away. Thank you.