[nrpe] "Unable to read output"

[atstake atstake]

I compiled nrpe without SSL & when I try to connect to the remote nrpe
daemon it says "Unable to read output"

root at server1:/usr/local/nagios/libexec # ./check_nrpe -n -H
172.16.20.5  -c check_disk1
NRPE: Unable to read output

First, I started the stand-alone daemon -
root at server2:/home/client/nrpe-2.5.2/src # ./nrpe -n -d -c /etc/nrpe.cfg

then checked if nrpe is running -
root at server2:/home/client/nrpe-2.5.2/src # ps aux | grep nrpe
1000       850  0.0  0.0   2032   504 ?        Ss   14:45   0:00
./nrpe -n -d -c /etc/nrpe.cfg

tcp        0      0 172.16.20.5:5666       0.0.0.0:* LISTEN      850/nrpe

here's my /etc/nrpe.cfg file -

pid_file=/tmp/nrpe.pid
server_port=5666
server_address=172.16.20.5
nrpe_user=client
nrpe_group=users
allowed_hosts=172.16.20.4
dont_blame_nrpe=0
debug=0
command_timeout=60
command[check_disk1]=/usr/local/nagios/libexec/check_disk -w 20 -c 10
-p /dev/sda2
command[check_disk2]=/usr/local/nagios/libexec/check_disk -w 20 -c 10
-p /dev/sdb1

I can ping/ssh both the hosts and no firewall blocking any port.

permission for /etc/nrpe.cfg is

-rw-rw-rw- 1 client users 6775 Dec  1 14:42 /etc/nrpe.cfg

/vag/log/messages on the daemon end

Dec  1 16:25:31 server2 nrpe[1711]: Starting up daemon
Dec  1 16:25:31 server2 nrpe[1711]: Listening for connections on port 5666
Dec  1 16:25:31 server2 nrpe[1711]: Allowing connections from: 172.16.20.4

I don't have nagios installed on where nrpe daemon is running.

Any kind of help would be much appreciated.

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