[CentOS] error mounting NFS client on NFS server

My NFS server is on 192.168.10.10, with the following setup in /etc/exports:
/backup 192.168.10.0/24(rw)

Then, form a client (192.168.10.11), I run mount  192.168.10.10:/backup 
/bck, but get the following error:
root at vps01 [~]# mount 192.168.10.10:/backup /bck
mount.nfs: Input/output error


On the main server, I see this in /var/log/messages:
Mar  8 08:42:52 venus kernel: kjournald starting.  Commit interval 5 seconds
Mar  8 08:42:52 venus kernel: EXT3 FS on dm-6, internal journal
Mar  8 08:42:52 venus kernel: EXT3-fs: mounted filesystem with ordered 
data mode.
Mar  8 08:43:02 venus mountd[10383]: authenticated mount request from 
192.168.10.11:989 for /backup (/backup)




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Kind Regards
Rudi Ahlers
CEO, SoftDux

Web:   http://www.SoftDux.com
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