Installation Media Questions

I have two quesitons about install media. I'm trying to do a zen update and got the error, "Media source ftp://ftp.gwdg.de/pub/linux/misc/suser-guru/rpm/10.1 does not contain the desired media" when it tried to update Guru. I opened up YaST and went to the installation sources, where I tried a refresh. I got the same error. I then opened the ftp site directly and see that there is a directory.yast file and all appears well. What gives? Second: I often get a "signature check failed" message when loading either YAST software or Zen. What is that? -- Kai Ponte www.perfectreign.com