YOU cannot update

Hello all, I have a problem with YaST Online Update. When I click to update from any of the ftp sites (default setting), it's connected then the progress bar shows 10% and jumps to 100%. Nothing's downloaded. Then it disconnects to the server. I have this problem for more than 5 months now. I was wondering if there is nothing to update at all. Please help Teratam Bunyagul