There are 10 other services running against this server, all of which work fine (which I suppose confirms that the Nagios host is in the npre.cfg file on the target, but in case it doesn't, I also confirmed that). We recently moved the website to this new server I'm trying to get working. This check worked fine on the old host.
Nagios XI server info:
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Red Hat Enterprise Linux Server release 6.9 (Santiago)
Linux 2.6.32-642.15.1.el6.x86_64 #1 SMP Mon Feb 20 02:26:38 EST 2017 x86_64 x86_64 x86_64 GNU/Linux
# virt-what
vmware
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OS Name: Microsoft Windows Server 2016 Datacenter
OS Version: 10.0.14393 N/A Build 14393
System Manufacturer: VMware, Inc.
System Model: VMware Virtual Platform
System Type: x64-based PC
I first did it this way,
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[root@<NAGIOS> etc]# /usr/local/nagios/libexec/check_http -H "<HOST>" -s "<STRING THAT'S THERE>" -f ok -S -p 443
Name or service not known
HTTP CRITICAL - Unable to open TCP socket
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[root@<NAGIOS> nagios]# /usr/local/nagios/libexec/check_http -I <IP> -s "<STRING THAT'S THERE>" -f ok -u "/<PATH>/" -ssl=1+ -p 443
HTTP CRITICAL - No data received from host
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[root@<NAGIOS> nagios]# /usr/local/nagios/libexec/check_http -H <URL> -f ok -ssl=1+ -p 443 -w 60 -c 120 -t 180 -v
GET / HTTP/1.1
User-Agent: check_http/v2.0.3 (nagios-plugins 2.0.3)
Connection: close
Host: <HOSTNAME>:443
Accept: */*
HTTP CRITICAL - No data received from host
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[root@<NAGIOS> nagios]# /usr/local/nagios/libexec/check_http -H <HOSTNAME> -s "<STRING THAT'S THERE>" -f ok -u "/<PATH>/" -ssl=1+ -p 443 -w 60 -c 120 -t 180 -v
GET /<PATH>/ HTTP/1.1
User-Agent: check_http/v2.0.3 (nagios-plugins 2.0.3)
Connection: close
Host: <HOSTNAME>:443
Accept: */*
HTTP CRITICAL - No data received from host
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[root@<NAGIOS> nagios]# curl -I https://<HOSTNAME>
HTTP/1.1 200 OK
Cache-Control: private
Content-Type: text/html; charset=utf-8
Server:
X-AspNet-Version: 4.0.30319
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
X-Content-Type-Options: nosniff
Strict-Transport-Security: max-age=31536000
Date: Tue, 21 Jan 2020 15:19:08 GMT
Content-Length: 10825
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[root@<NAGIOS> nagios]# wget https://<HOSTNAME>
--2020-01-21 09:19:46-- https://<HOSTNAME>/
Resolving <HOSTNAME>... <IP>
Connecting to <HOSTNAME>|<IP>|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 10825 (11K) [text/html]
Saving to: “index.html”
100%[======================================================================================>] 10,825 --.-K/s in 0s
As I finished writing this post, I thought to test another of the sites running on this server, and it worked.
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[root@<NAGIOS> nagios]# /usr/local/nagios/libexec/check_http -H <URL2> -f ok --ssl=1+ -p 443
HTTP OK: HTTP/1.1 200 OK - 955 bytes in 0.065 second response time |time=0.065191s;;;0.000000 size=955B;;;0