CHECK_NRPE: Received 0 bytes from daemon. Check the remote server logs for error messages

[Andy Shellam]

By default on NRPE you are not allowed to use commandline arguments, 
that is - passing something like "check_nrpe -H debianserver -p 5666 -c 
check_ping!$HOSTADDRESS$", and having in your nrpe.cfg 
"command[check_ping]=/usr/local/nagios/libexec/check_ping -H $ARG1$".

This is dangerous in that a client connecting to the daemon could 
execute an aribitrary command against check_ping (consider this: a 
hacker sends "127.0.0.1 && rm -rf /" as an argument to check_ping, and 
your system will execute "/usr/local/nagios/libexec/check_ping -H 
127.0.0.1 && rm -f /")

Therefore command arguments are disabled in NRPE by default, so you 
would have to hard-code your checks on the local machine. (e.g. 
command[check_ping]=/usr/local/nagios/libexec/check_ping -H localhost), 
and simply use "check_nrpe -H debianserver -p 5666 -c check_ping".

If you are aware of the danger, have applied appropriate connection 
limitations (i.e. firewalling, changing nrpe port, only allowing certain 
IPs to connect) and want to use command arguments, then you have to add 
an extra command to the ./configure line of the NRPE on the client and 
enable a command argument setting in nrpe.cfg. You'll have to read 
nrpe.cfg for the details as I cannot remember off-hand what they are.

Andy.

Ranjeet Kumar wrote:
>
> Hi,
>
> I configured the Nagios on Fedora Core 4. I am getting results 
> locally. I configure another fedora linux as client and configure 
> NRPE. Here also I am getting all results except the ping.
>
> Here I am getting error “You must specify a server address or host name “
>
> I also configured debian linux as client and configure NRPE. Here I am 
> not getting any results. It gives message “CHECK_NRPE: Received 0 
> bytes from daemon. Check the remote server logs for error messages”. 
> On remote server i.e. debain linux it gives error message: -
>
> Aug 30 16:31:45 debianserver snmpd[3426]: Connection from 192.168.157.53
>
> Aug 30 16:31:45 debianserver last message repeated 3 times
>
> Aug 30 16:31:51 debianserver identd[26372]: started
>
> Aug 30 16:31:54 debianserver snmpd[3426]: [smux_accept] accepted fd 11 
> from 192.168.157.53:46122
>
> Aug 30 16:31:57 debianserver snmpd[3426]: Connection from 192.168.157.53
>
> Aug 30 16:32:04 debianserver last message repeated 66 times
>
> Aug 30 16:33:07 debianserver nrpe[26380]: Error: Request contained 
> command arguments, but argument option is not enabled!
>
> Aug 30 16:33:07 debianserver nrpe[26380]: Client request was invalid, 
> bailing out...
>
> Aug 30 16:34:16 debianserver nrpe[26382]: Error: Request contained 
> command arguments, but argument option is not enabled!
>
> Aug 30 16:34:16 debianserver nrpe[26382]: Client request was invalid, 
> bailing out...
>
> Please help me in solving this issue.
>
> I used following version: -
>
> Nagios 2.5.2
>
> Nagios-plugin 1.4.3
>
> NRPE 2.5.2
>
> Thanks,
>
> Ranjeet
>
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-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
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