[Nagiosplug-help] Using check_http plugin behind the firewall

Risto Vaarandi risto.vaarandi at eyp.ee
Wed Sep 15 03:08:06 CEST 2004

Rahul Misra wrote:
> Risto, you might wanna try the -S option with check_http and see if it meets
> your requirements. The SSL is brought into the picture when you use it.

On the second commandline I have used the --ssl option (see below) which 
is a synonym for -S, yet it didn't work. Is it really not possible to 
handle the problem with some clever options of check_http? It is quite 
common for the monitoring server to be located behind a firewall/proxy, 
and the https-webservers you wish to monitor in the public Internet.

> Regards
> Rahul
> -----Original Message-----
> From: Risto Vaarandi [mailto:risto.vaarandi at eyp.ee] 
> Sent: Tuesday, September 14, 2004 7:20 PM
> To: nagiosplug-help at lists.sourceforge.net
> Subject: [Nagiosplug-help] Using check_http plugin behind the firewall
> hi all,
> I would like to use the check_http plugin for monitoring some external web
> servers. While the plugin works fine for conventional http-servers, e.g.,
> -sh-2.05b$ /usr/lib/nagios/plugins/check_http -H firewall -p 8080 -u
> http://www.hansa.ee HTTP OK HTTP/1.0 200 OK - 66 bytes in 0.046 seconds
> |time=46009us;;;0 size=66B;;;0
> I can't connect to https-servers:
> -sh-2.05b$ /usr/lib/nagios/plugins/check_http -H firewall -p 8080 -u
> https://www.hansa.ee HTTP WARNING: HTTP/1.0 400 Bad Request
> -sh-2.05b$ /usr/lib/nagios/plugins/check_http -H firewall -p 8080 --ssl -u
> https://www.hansa.ee
> ERROR: Cannot retrieve server certificate.
> Does the check_http plugin have any commandline options for solving this
> problem? (The plugin should first create a tcp socket to the 8080 port of
> the firewall, then use the CONNECT method for connecting to target web
> server, and finally switch to SSL protocol.)
> br,
> risto
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