Hi, I am in the proces of upgrading my CentOS 4.1 servers to 4.2. I've burnt CentOS 4.2 CD's from the ISO images (these images work because I already installed a new server with it), but I am unable to upgrade the existing servers to 4.2 using the CD's.... Does anybody have a clue, why this is not working... or is the online update option the only one... Thom