I have a RHEL 5 server on which i had enable it to work as NFS share -- shares are enable and while i configured yum -- created a repository to locate as /var/ftp/pub/Server -- /var/ftp/pub/images -- /var/ftp/pub/VT

Now when i do yum update all command on the prompt it gives me an error on screen
ftp://10.208.131.73:/var/ftp/pub/Server/repodata/repomd.xml: [Errno 4 IOError: error (-2, 'Name or Service not Known')>
Trying other mirror
Error: Cannot open/read repomd.xmlfile for repository: Server

Can you help what is causing this???

Also I tried the command createrepo to create a repository it is not allowing me to create it. please let me know what i am doing wrong here. its urgent....!