The UTD Linux Users Group renamed itself to the Free Software Lab of UTD. The domain name changed also from mirror.utdlug.org to mirror.fslutd.org. The path to Gentoo stuff remains the same. The current domain name will expire in October. Right now this mirror is both for packages and for Portage.
Changed on the website now. Domain is not used in bouncer or thirdpartymirrors. Sorry about the delay, we're looking into why it happened.