configure nrpe and nagios error

 1check the service of nrpe 

[root@MONITOR nrpe]# libexec/check_nrpe -H 59.26.240.63
NRPE v2.8.1
2check the resource of nrpe's host
[root@MONITOR nrpe]# libexec/check_nrpe -H 59.26.240.63 -c check_df
DISK OK - free space: / 8241 MB (77% inode=98%); /var 5239 MB (95% inode=99%); /usr 11971 MB (86% inode=97%); /dev/shm 1013 MB (100% inode=99%);| /=2417MB;11218;11228;0;11238 /var=273MB;5792;5802;0;5812 /usr=1807MB;14508;14518;0;14528 /dev/shm=0MB;993;1003;0;1013
[root@MONITOR nrpe]#libexec/check_nrpe -H 59.26.240.63 -c check_ips
OK -connect counts is 13956

I have already add 192.168.1.200locate ipand 192.168.1.8 to nrpe.cfg
allowed_hosts=127.0.0.1,192.168.1.200192.168.1.8
[root@MONITOR nrpe]# libexec/check_nrpe -H 127.0.0.1
NRPE v2.8.1

[root@MONITOR nrpe]# libexec/check_nrpe -H 192.168.1.200
connect confused ??why ,it is itself
[root@MONITOR nrpe]# libexec/check_nrpe -H 192.168.1.8
I can't also monitoring the windows of the LAN.

3check the error of configure with nagios
[root@nagios-server etc]# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

Nagios 2.9
Copyright (c) 1999-2007 Ethan Galstad (Nagios - link removed))
Last Modified: 04-10-2007
License: GPL

Reading configuration data...

Running pre-flight check on configuration data...

Checking services...
Error: Service check command 'check_nrpe' specified in service 'check-disk' for host 'nagios-server' not defined anywhere!
Error: Service check command 'check_nrpe' specified in service 'check-load' for host 'nagios-server' not defined anywhere!
Error: Service check command 'check_nrpe' specified in service 'total_procs' for host 'nagios-server' not defined anywhere!
Checked 5 services.
Checking hosts...
Error: Contact group 'nagios' specified in host 'nagios-server' is not defined anywhere!
Checked 1 hosts.
Checking host groups...
Checked 1 host groups.
Checking service groups...
Checked 0 service groups.
Checking contacts...
Error: Service notification command 'service-notify-by-email' specified for contact 'sery' is not defined anywhere!
Checked 1 contacts.
Checking contact groups...
Checked 1 contact groups.
Checking service escalations...
Checked 0 service escalations.
Checking service dependencies...
Checked 0 service dependencies.
Checking host escalations...
Checked 0 host escalations.
Checking host dependencies...
Checked 0 host dependencies.
Checking commands...
Checked 24 commands.
Checking time periods...
Checked 1 time periods.
Checking extended host info definitions...
Checked 0 extended host info definitions.
Checking extended service info definitions...
Checked 0 extended service info definitions.
Checking for circular paths between hosts...
Checking for circular host and service dependencies...
Checking global event handlers...
Checking obsessive compulsive processor commands...
Checking misc settings...

Total Warnings: 0
Total Errors: 5

***> One or more problems was encountered while running the pre-flight check...

 Check your configuration file\(s\) to ensure that they contain valid
 directives and data defintions.  If you are upgrading from a previous
 version of Nagios, you should be aware that some variables/definitions
 may have been removed or modified in this version.  Make sure to read
 the HTML documentation regarding the config files, as well as the
 'Whats New' section to find out what has changed.

[root@nagios-server etc]#

Help me to solve this problem,Thanks very much.
contact with:
update by scottn: email address removed.