CHECK_NRPE: Received 0 bytes. Are we allowed t o connect to the ho st?

[Ewan Leith]

does tcpd actually exist on the server? if not, edit /etc/inetd.conf to
remove the part of the command referring to /usr/sbin/tcpd so you're only
left with the /usr/local/nagios/bin/nrpe, or install tcpd which is part of
the tcp_wrappers package, im sure there are solaris+redhat install files for
it out there.
 
tcpd is a program with some security features inetd probably should have
built in but doesnt, it handles things like checking what IP address is
making the connection and verifying its on an allowed list.
 
Ewan

-----Original Message-----
From: David Levine [mailto:dlevine at seasontickets.com]
Sent: 28 February 2003 16:25
To: Nagios Users List (E-mail)
Subject: RE: [Nagios-users] CHECK_NRPE: Received 0 bytes. Are we allowed t o
connect to the ho st?


Sorry - I should have posted this as well...
Here is a line from /var/adm/messages :
 
Feb 28 10:04:09 obiwan inetd[10323]: [ID 388736 daemon.error] execv
/usr/sbin/tcpd: No such file or directory
 
Can anyone provide some insight?
 
Tx
 
David

-----Original Message-----
From: David Levine [mailto:dlevine at seasontickets.com]
Sent: Thursday, February 27, 2003 6:41 PM
To: Nagios Users List (E-mail)
Subject: [Nagios-users] CHECK_NRPE: Received 0 bytes. Are we allowed to
connect to the ho st?


Hi all  -
 
I am having a bit of trouble with NRPE....
 
NRPE 1.8
nagios host: RH Linux 7.2
remote host: Solaris 8 x86
 
I am getting the error:
[nagios at vader libexec]$ ./check_nrpe -H obiwan -c check_oracle_pmon
CHECK_NRPE: Received 0 bytes.  Are we allowed to connect to the host?
 
I am running the NRPE daemon on the remote host as such:
[nagios at obiwan ~/bin]$./nrpe -c /opt/local/nagios/bin/nrpe.cfg --daemon
 
I can see that the remote host is listening on the correct port:
[nagios at obiwan ~/bin]$netstat -an | grep 5666
      *.5666               *.*                0      0 65536      0 LISTEN
192.168.100.78.5666  192.168.100.33.39932  5840      0 66608      0
TIME_WAIT
192.168.100.78.5666  192.168.100.33.39990  5840      0 66608      0
TIME_WAIT
 
However - I cannot see any PID associated with the NRPE daemon (output from
ps -ef)?
 
The command (plugin) that I am running on the remote host works fine:
[nagios at obiwan ~/libexec]$./check_oracle --db PRACTICE
PRACTICE OK - 1 PMON process(es) running
 
Here are (from what I can see) the relevant portions of nrpe.cfg:
allowed_hosts=127.0.0.1, 192.168.100.33
command[check_oracle_pmon]=/opt/local/nagios/libexec/check_oracle --db
PRACTICE
 
Configurations on my NAGIOS host:
checkcommands.cfg:
 
# 'check_nrpe' command definition
define command{
 command_name check_nrpe
 command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
 }
 
services.cfg:
 
# Service Description -- Verify Oracle instance is running (checking for
PMON)
define service{
 use    ti-template
 host_name   obiwan
 service_description  Oracle 8i PMON
 check_command   check_nrpe!check_oracle_pmon
 }
 
 
So...
Am I missing the obvious?
 
TIA for sharing any advice / experience...
 
-D
 
David Levine
Systems Administrator
Ticket Innovations, Inc.
1555 Mittel Blvd. Suite J
Wood Dale, IL 60191
Voice: 630-477-8329
Fax: 630-787-9951
dlevine at seasontickets.com <mailto:dlevine at seasontickets.com> 
 



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