need urgent help

[fsodah]

after the upgrade 5.7.1 i received the following

"CHECK_NRPE: Receive header underflow - only 0 bytes received (4 expected)."

before the upgrade the nrpe was running prefect

From command line is running.

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[root@nagios ~]# /usr/local/nagios/libexec/check_nrpe -H localhost
NRPE v4.0.3
[root@nagios ~]# /usr/local/nagios/libexec/check_nrpe -H 10.35.3.11
NRPE v3.2.1

[cdienger]

The upgrade to NRPE 4 is likely the issue. Try running the command with the "-3" option:

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/usr/local/nagios/libexec/check_nrpe -H 10.35.3.11 -3

[fsodah]

Code: Select all

[root@nagios ~]# /usr/local/nagios/libexec/check_nrpe -H 10.38.10.1 -3
NRPE v3.2.1
[root@nagios ~]# /usr/local/nagios/libexec/check_nrpe -H 10.38.10.1 
NRPE v3.2.1
[root@nagios ~]# 

I solved by changing the parameter dont_blame to 1 instead of 0 ... it works fine

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# COMMAND ARGUMENT PROCESSING
# This option determines whether or not the NRPE daemon will allow clients
# to specify arguments to commands that are executed.  This option only works
# if the daemon was configured with the --enable-command-args configure script
# option.
#
# *** ENABLING THIS OPTION IS A SECURITY RISK! ***
# Read the SECURITY file for information on some of the security implications
# of enabling this variable.
#
# Values: 0=do not allow arguments, 1=allow command arguments

dont_blame_nrpe=1

Can you please confirm if that is the proper way ... after changing the parameter working correctly since 3 days.

[cdienger]

I missed a digit in the command. It should have been:

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/usr/local/nagios/libexec/check_nrpe -H 10.38.10.11 -3

Test and let me know your results.

The error you see is commonly associated with the dont_blame_nrpe option(https://support.nagios.com/kb/article/n ... s-618.html) but it doesn't make sense to me why a setting that the upgrade doesn't touch would be the problem. Does it return valid responses with this option? Generally we recommend enabling this option so you can keep it enabled.

[fsodah]

I 'll keep this topic open, till I test your recommendation.

[cdienger]

Sounds good. Keep us posted.

[fsodah]

done ... close it

[scottwilkerson]

done ... close it

Great!

Locking thread