[Nagiosplug-help] NRPE: Unable to read output

Andreas Wehrmann a.wehrmann at centersystems.com
Fri Feb 20 07:53:18 CET 2009

hmm strange, does it work without encryption?


Brian Tomjack wrote:
> Unfortunately i think that nrpe thinks its just fine as well. the only 
> thing in the logs (with debugging set to 1 in the nrpe.cfg) are lines of 
> the following every 10 minutes when nagios checks the load and the mailq
> Feb 19 11:39:38 ns1 xinetd[27766]: START: nrpe pid=9248 
> from=nagios.server.ip.address
> Feb 19 11:39:38 ns1 nrpe[9248]: INFO: SSL/TLS initialized. All network 
> traffic will be encrypted.
> Feb 19 11:39:39 ns1 xinetd[27766]: EXIT: nrpe status=0 pid=9248 
> duration=1(sec)
> Feb 19 11:39:42 ns1 xinetd[27766]: START: nrpe pid=9256 
> from=nagios.server.ip.address
> Feb 19 11:39:42 ns1 nrpe[9256]: INFO: SSL/TLS initialized. All network 
> traffic will be encrypted.
> Feb 19 11:39:42 ns1 xinetd[27766]: EXIT: nrpe status=0 pid=9256 
> duration=0(sec)
> good thought though,
> Brian
> Andreas Wehrmann wrote:
>> Stupid questions, but have you looked into the log messages?
>> I had some similiar problem and the log told me that the machine that's
>> trying to get information via nrpe is not allowed.
>> Hopefully it's just as easy as that.
>> Regards,
>> Andreas
>> Brian Tomjack wrote:
>>> Well i think this is the right place for this, since it seems plugin 
>>> related to me.
>>> Here is the setup, my nagios server is on the same network, behind 
>>> the core router. The server i am trying to monitor is behind an 
>>> outlying firewall. I have configured both to work over port 5666 and 
>>> have opened the appropriate firewall port to the remote host.
>>> I know that nagios i working fine because it has several hundred 
>>> other hosts on it all working fine. and i know that nrpe must be 
>>> (mostly) working ok on the remote host in question because the 
>>> check_load via nrpe is working fine to that remote host.
>>> My problem is that when the nagios server checks the mailq on the 
>>> remote host it gets back:
>>> [root at ns1 ~]# /usr/local/nagios/libexec/check_nrpe -H 
>>> remote.server.ip.address -c check_mailq
>>> NRPE: Unable to read output
>>> on the remote host, in the nrpe config:
>>> command[check_mailq]="sudo /usr/local/nagios/libexec/check_mailq -w 
>>> 120 -c 175"
>>> from the remote host /etc/sudousers:
>>> nagios ALL=NOPASSWD: /usr/local/nagios/libexec/check_mailq
>>> now, on the remote host, i can run it manually and get:
>>> [nagios at ns1 ~]$ sudo /usr/local/nagios/libexec/check_mailq -w 120 -c 175
>>> CRITICAL: mailq is 194 (threshold c = 175)|unsent=194;120;175;0
>>> and finally, on the remote host. if i configure it to allow requests 
>>> from and run the nrpe command i get this:
>>> [nagios at ns1 ~]$ /usr/local/nagios/libexec/check_nrpe -H -c 
>>> check_mailq
>>> NRPE: Unable to read output
>>> (the same result as when run from the nagios server)
>>> so im stumped. the plugin is working on the remote host, and nrpe is 
>>> working because i can execute the check_load via nrpe from the nagios 
>>> server to the remote host and it works just fine. its only when i run 
>>> the check_mailq via nrpe do i get a output read error. the nagios 
>>> server is a fedora server, the remote host is a centos server. im not 
>>> sure what else to check on so any suggestions are appreciated, as 
>>> this is the only machine that i am having problems monitoring the 
>>> mailq on.
>>> Brian
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