NTLM authentication no longer works

From http://forum.rssbandit.org/topic.asp?TOPIC_ID=2662

GET /index.php?title=Special:Newpages&feed=atom HTTP/1.1
User-Agent: RssBandit/1.8.0.870 (.NET CLR 2.0.50727.1433; WinNT 5.1.2600 Service Pack 2; http://www.rssbandit.org)
Host: intranetwiki
Cookie: mediawikiUserName=Nxxxxxxx; mediawikiUserID=5
Accept-Encoding: gzip, deflate
Connection: Keep-Alive

HTTP/1.1 401 Unauthorized
Content-Length: 1656
Content-Type: text/html
Server: Microsoft-IIS/6.0
WWW-Authenticate: Negotiate
WWW-Authenticate: NTLM
Date: Wed, 28 Jan 2009 21:10:37 GMT