Ok, that should not be happening as the Packages lists are updated several times a day on our server. What you see is when a particular .deb file that is needed is not available on the Debian server yet there is network connectivity.
Try first these commands before importing again:
sudo rm /etc/sysconfig/tcedir/debian_jessie_main*
sudo rm /etc/sysconfig/tcedir/debian_jessie_security*