HTTP WARNING: HTTP/1.1 400 Bad Request

[epixelitsupport]

Hi , Im using Cloudflare and nginx in hosting server and I'm getting this warning in nagios GUI

Its showing error as HTTP WARNING: HTTP/1.1 400 Bad Request - 166 bytes in 0.472 second response time

Please let me a solution for this to get rid of it

Thank you in Advance

[cdienger]

What OS is it installed on ? It sounds like there is a problem with nginx config. Did you follow specific steps from a source you can link to? https://www.linuxhelp.com/how-to-instal ... -on-centos steps through installing nagios with nginx on a cent machine.

[epixelitsupport]

What OS is it installed on ? It sounds like there is a problem with nginx config. Did you follow specific steps from a source you can link to? https://www.linuxhelp.com/how-to-instal ... -on-centos steps through installing nagios with nginx on a cent machine.

Iam using Ubuntu 18.04 and this is the error I'm getting https://prnt.sc/s012bq

Please check it

[cdienger]

Okay. I misunderstood initially. It sounds like you are using Nagios to check on the nginx server. What does the configuration of this service check look like and what plugin are you using?

[epixelitsupport]

Okay. I misunderstood initially. It sounds like you are using Nagios to check on the Nginx server. What does the configuration of this service check look like and what plugin are you using?

I'm using nrpe on the client server and this is how we are running the command in nations server https://prnt.sc/s0argw

[cdienger]

What does the host definition look like?

Try running the following from the command line:

Code: Select all

/usr/local/nagios/libexec/check_http -H nginx_address -v
curl nginx_address -v

?

[epixelitsupport]

What does the host definition look like?

Try running the following from the command line:

Code: Select all

/usr/local/nagios/libexec/check_http -H nginx_address -v
curl nginx_address -v

?

Yes That one is Working Perfectly here
https://prnt.sc/s0r0zl

[cdienger]

Please provide the check_http command definition as well as the host definition.

[epixelitsupport]

Please provide the check_http command definition as well as the host definition.

means , where I get this?

is this asking for https://prnt.sc/s0rp8p

And this also https://prnt.sc/s0s71j

[cdienger]

Yes, and you should also have one for the host that looks like:

Code: Select all

define host {
    host_name ...
    address ...
    ...
}

The likely problem is that using "-I" causes the check to use the IP address which may not work if the IP hosts multiple websites. Change the command to use -H instead:

Code: Select all

define command{
	command_name 	check_http
	command_line	$USER1$/check_http -I $HOSTADDRESS$ $ARG1$
}