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CHECK_NRPE: Received 0 bytes

https://support.nagios.com/forum/viewtopic.php?t=41120

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Re: CHECK_NRPE: Received 0 bytes

Posted: Tue Nov 15, 2016 5:59 pm
by avandemore
There are a lot of variables at play here so that requested debug.log would be useful.

Also from the nagios side, you can increase the check_nrpe timeout with the -t argument.

Re: CHECK_NRPE: Received 0 bytes

Posted: Tue Nov 15, 2016 6:00 pm
by tgriep
I thing I found the issue.
Can you edit the nsclient.ini file on that Windows system and change the following lines from

Code: Select all

check_process2 = cscript.exe //T:115 //NoLogo scripts\\check_process2.vbs $ARGS"$
check_cpu_queue = cscript.exe //T:115 //NoLogo scripts\\check_cpu_queue.vbs $ARGS"$
to

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check_process2 = cscript.exe //T:115 //NoLogo scripts\\check_process2.vbs $ARG1$ $ARG2$
check_cpu_queue = cscript.exe //T:115 //NoLogo scripts\\check_cpu_queue.vbs $ARG1$ $ARG2$
Restart NSClient and see if that fixes it.

Re: CHECK_NRPE: Received 0 bytes

Posted: Wed Nov 16, 2016 10:10 am
by gormank
Duh... That's does look wrong. Good eye.

Re: CHECK_NRPE: Received 0 bytes

Posted: Wed Nov 16, 2016 10:45 am
by gormank
They still do the same after the change. I remember the person who set things up with that extra quote said it was needed at the time...

Re: CHECK_NRPE: Received 0 bytes

Posted: Wed Nov 16, 2016 1:15 pm
by tgriep
Yesterday, avandemore suggested turning on debugging for the nsclient.log file, can you do that, restart nsclient, run the check a few times and post the nsclient.log file so we can view the errors?
Then, remove the debugging setting so the log file will not get really large.
Thanks

Re: CHECK_NRPE: Received 0 bytes

Posted: Wed Nov 16, 2016 2:02 pm
by gormank
Sorry, I missed the debug request. I'll get it.

Re: CHECK_NRPE: Received 0 bytes

Posted: Wed Nov 16, 2016 2:46 pm
by tgriep
No Problem, whenever you are ready.

Re: CHECK_NRPE: Received 0 bytes

Posted: Thu Nov 17, 2016 11:42 am
by gormank
I've attached the log (starting yesterday) and the events from midnight today . See line 2041 and 2043 for the 1st error after midnight at 00:59.
If you look at the log bit pasted below, you'll see 3 lines w/ --- showing the command sent, the failure, and the successful retry.
I don't see any useful info, but one odd thing is the times of the errors logged don't seem to quite match. I checked time sync, and compared time between the Nagios and app server and they were the same to the second.

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# grep Win /usr/local/nagios/var/nagios.log | cut -c 1-105 | perl -pe 's/(\d+)/localtime($1)/e' | grep UNKNOWN | grep txslm2mwapp008
[Thu Nov 17 00:59:35 2016] SERVICE ALERT: txslm2mwapp008;FS_Win_IO;UNKNOWN;SOFT;1;CHECK_NRPE: Received 0 bytes from dae
[Thu Nov 17 01:50:05 2016] SERVICE ALERT: txslm2mwapp008;CPU_Win_Queue;UNKNOWN;SOFT;1;CHECK_NRPE: Received 0 bytes from
[Thu Nov 17 02:40:35 2016] SERVICE ALERT: txslm2mwapp008;FS_Win_IO;UNKNOWN;SOFT;1;CHECK_NRPE: Received 0 bytes from dae
[Thu Nov 17 03:31:05 2016] SERVICE ALERT: txslm2mwapp008;CPU_Win_Queue;UNKNOWN;SOFT;1;CHECK_NRPE: Received 0 bytes from
[Thu Nov 17 04:21:35 2016] SERVICE ALERT: txslm2mwapp008;FS_Win_IO;UNKNOWN;SOFT;1;CHECK_NRPE: Received 0 bytes from dae
[Thu Nov 17 05:12:05 2016] SERVICE ALERT: txslm2mwapp008;CPU_Win_Queue;UNKNOWN;SOFT;1;CHECK_NRPE: Received 0 bytes from
[Thu Nov 17 06:03:05 2016] SERVICE ALERT: txslm2mwapp008;CPU_Win_Queue;UNKNOWN;SOFT;1;CHECK_NRPE: Received 0 bytes from
[Thu Nov 17 07:27:35 2016] SERVICE ALERT: txslm2mwapp008;FS_Win_IO;UNKNOWN;SOFT;1;CHECK_NRPE: Received 0 bytes from dae
[Thu Nov 17 07:44:05 2016] SERVICE ALERT: txslm2mwapp008;CPU_Win_Queue;UNKNOWN;SOFT;1;CHECK_NRPE: Received 0 bytes from
[Thu Nov 17 09:08:35 2016] SERVICE ALERT: txslm2mwapp008;FS_Win_IO;UNKNOWN;SOFT;1;CHECK_NRPE: Received 0 bytes from dae
[Thu Nov 17 10:50:05 2016] SERVICE ALERT: txslm2mwapp008;CPU_Win_Queue;UNKNOWN;SOFT;1;CHECK_NRPE: Received 0 bytes from
[Thu Nov 17 12:14:35 2016] SERVICE ALERT: txslm2mwapp008;FS_Win_IO;UNKNOWN;SOFT;1;CHECK_NRPE: Received 0 bytes from dae
[Thu Nov 17 15:20:35 2016] SERVICE ALERT: txslm2mwapp008;FS_Win_IO;UNKNOWN;SOFT;1;CHECK_NRPE: Received 0 bytes from dae
[Thu Nov 17 16:11:05 2016] SERVICE ALERT: txslm2mwapp008;CPU_Win_Queue;UNKNOWN;SOFT;1;CHECK_NRPE: Received 0 bytes from

Code: Select all

---2016-11-17 00:58:55: debug:D:\source\nscp\modules\CheckExternalScripts\CheckExternalScripts.cpp:459: Command line: cscript.exe //T:115 //NoLogo scripts\\winFSIO.vbs
2016-11-17 00:59:15: debug:D:\source\nscp\include\nrpe/server/protocol.hpp:74: Accepting connection from: 10.133.134.84, count=1
2016-11-17 00:59:25: debug:D:\source\nscp\include\nrpe/server/protocol.hpp:74: Accepting connection from: 10.133.134.84, count=1
2016-11-17 00:59:25: debug:D:\source\nscp\modules\CheckExternalScripts\CheckExternalScripts.cpp:459: Command line: cscript.exe //T:115 //NoLogo scripts\\check_cpu_queue.vbs 4 6
2016-11-17 00:59:35: debug:D:\source\nscp\include\nrpe/server/protocol.hpp:74: Accepting connection from: 10.133.134.84, count=1
2016-11-17 00:59:35: debug:D:\source\nscp\modules\CheckExternalScripts\CheckExternalScripts.cpp:459: Command line: cscript.exe //T:115 //NoLogo scripts\\Virus_detected.vbs
---2016-11-17 00:59:41: error:D:\source\nscp\include\socket/connection.hpp:149: Failed to send data: The file handle supplied is not valid
2016-11-17 00:59:55: debug:D:\source\nscp\include\nrpe/server/protocol.hpp:74: Accepting connection from: 10.133.134.84, count=1
---2016-11-17 00:59:55: debug:D:\source\nscp\modules\CheckExternalScripts\CheckExternalScripts.cpp:459: Command line: cscript.exe //T:115 //NoLogo scripts\\winFSIO.vbs
2016-11-17 00:59:57: debug:D:\source\nscp\include\nrpe/server/protocol.hpp:74: Accepting connection from: 10.133.134.84, count=1
2016-11-17 00:59:57: debug:D:\source\nscp\include\compat.cpp:22: Created command: warn=free<=20% crit=free<=10% "detail-syntax=%(drive): Total: %(size) - Used: %(used) (%(used_pct)%) - Free: %(free) (%(free_pct)%)" show-all "filter=type in ('fixed')"

Re: CHECK_NRPE: Received 0 bytes

Posted: Thu Nov 17, 2016 1:49 pm
by tgriep
I setup my Windows system with the scripts that you uploaded and configured the nsclient.ini file like yours.
I have the winfsio script running without any errors. See below

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./check_nrpe -H 192.168.5.223 -c winfsio
Total Summary: 0 IO/s, Write/s 99 Reads/s: 0 Transfers/s: 99|'split_total'=0 'tps_total'=99;;;0
I an running an older version of NSClient 0.4.4.10, maybe there is a bug in the newer one.

I couldn't get the check_cpu_queue.vbs script to work, it has a compilation error.
It looks like the script that was uploaded is incomplete.
Also, it writes to a file in c:\temp make sure that exists on the Windows server.

Re: CHECK_NRPE: Received 0 bytes

Posted: Thu Nov 17, 2016 1:58 pm
by gormank
As I've said numerous times, the scripts work, they just fail a little less than once an hour on a few of the hundreds of boxes they run on. They succeed a few seconds later when retried, as shown in the log snippet and log.
See attached.
All times are UTC-05:00
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