As far as I know the passwords are correct,
only the link to the redirect server has changed.
In your UTEngine.ini in the section:
[IpDrv.HTTPDownload]
RedirectToURL=http://uz3.gameservers.net/ut3/
UseCompression=True
[IpDrv.TcpNetDriver]
DownloadManagers=IpDrv.HTTPDownload
AllowDownloads=False
--------------------
You can upload only compressed maps.
For this you can use the UT3 Files Tool, wich you can find here:
http://files.filefront.com/UT3+Files.../fileinfo.html