Common NFS error

Root-NFS: Unable to get nfsd port number from server, using default
Looking up port of RPC 100005/1 on 107.108.71.79
Root-NFS: Unable to get mountd port number from server, using default
mount: server 107.108.71.79 not responding, timed out
Root-NFS: Server returned error -5 while mounting /nfs/cosmos_1302/rootfs_Bala_samba/rootfs
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "nfs" or unknown-block(2,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
Rebooting in 180 seconds..

Soln: NFS on the machine is not started. Restart nfs using the command "service nfs restart"