NFS mounts but ls says "Input/output error"



I'm setting up a KnoppMyth box (R5F27, kernel 2.6.18) as a PVR, and
I'd like to give it access to all my MP3s, MPEGs, etc. on my main box
(Slack 10.2, kernel 2.6.13). I added an entry to /etc/exports on the
Slackware box:

/home/cjg 192.168.0.0/255.255.255.0(ro)

and rebooted; ps shows 8 copies of nfsd running. Over on the
KnoppMyth box, I created a mount point (/mnt/cjg) and typed:

mount 192.168.0.33:/home/cjg /mnt/cjg

The command was accepted - but when I try ls /mnt/cjg I get:

ls: reading directory /mnt/cjg: Input/output error

rpcinfo on the server (Slackwar) gives the following:

program vers proto port
100000 2 tcp 111 portmapper
100000 2 udp 111 portmapper
100011 1 udp 975 rquotad
100011 2 udp 975 rquotad
100011 1 tcp 978 rquotad
100011 2 tcp 978 rquotad
100003 2 udp 2049 nfs
100003 2 tcp 2049 nfs
100021 1 udp 32770 nlockmgr
100021 3 udp 32770 nlockmgr
100021 1 tcp 32769 nlockmgr
100021 3 tcp 32769 nlockmgr
100005 1 udp 985 mountd
100005 1 tcp 988 mountd
100005 2 udp 985 mountd
100005 2 tcp 988 mountd
100005 3 udp 985 mountd
100005 3 tcp 988 mountd
100024 1 udp 993 status
100024 1 tcp 996 status

while rpcinfo on the client (KnoppMyth) says:

program vers proto port
100000 2 tcp 111 portmapper
100000 2 udp 111 portmapper
100021 1 udp 32768 nlockmgr
100021 3 udp 32768 nlockmgr
100021 4 udp 32768 nlockmgr
100021 1 tcp 36516 nlockmgr
100021 3 tcp 36516 nlockmgr
100021 4 tcp 36516 nlockmgr

It looks as though I'm most of the way there. Any hints as to
what's going wrong?

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