Website monitoring conflicting information SSL

DoubleDoubleA · Post by **DoubleDoubleA** » Thu Feb 09, 2017 5:30 pm

I ran the wizard to monitor a website, and I used the four default settings.

The dashboard for the site shows

CRITICAL - Cannot make SSL connection.

With this error:

139701147264872:error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol:s23_clnt.c:769:

Here's the thing, though: I can point a browser at the site, it resolves, and it is https.

What is the source of the mismatch do you suppose?

rkennedy · Post by **rkennedy** » Thu Feb 09, 2017 5:32 pm

From the CLI of XI - can you run the following and post it back here? This will give us a bit more verbosity as to what's going on with the connection.

Code: Select all

curl -v https://site.fqdn/path/to/your/page.ext

DoubleDoubleA · Post by **DoubleDoubleA** » Fri Feb 10, 2017 1:22 pm

Ok, looking back at it I think I didn't understand what the wizard would do with the information I put in there.

So, I deleted that host config and started over.

Three things:

1) When I first use the website monitoring wizard, after I put in the URL, I get a new page that shows the URL and the IP and all that ... just below that there is a section called Website Options where it asks if I want to monitor with SSL, and asks about login credentials. What does that do/how does that work?

2) So when I re-ran the config wizard, I did not check the box associated with "Use SSL". So I don't have that error this time, but now I have a new one for HTTP it shows:

HTTP CRITICAL - Invalid HTTP response received from host on port 443: <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">

The site is up, I can get to it.

3) Here's that curl you asked for

curl -v https://it4smbs.com
* About to connect() to it4smbs.com port 443 (#0)
* Trying 65.181.125.105... connected
* Connected to it4smbs.com (65.181.125.105) port 443 (#0)
* Initializing NSS with certpath: sql:/etc/pki/nssdb
* CAfile: /etc/pki/tls/certs/ca-bundle.crt
CApath: none
* SSL connection using TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
* Server certificate:
* subject: CN=it4smbs.com
* start date: Dec 28 21:39:00 2016 GMT
* expire date: Mar 28 21:39:00 2017 GMT
* common name: it4smbs.com
* issuer: CN=Let's Encrypt Authority X3,O=Let's Encrypt,C=US
> GET / HTTP/1.1
> User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.21 Basic ECC zlib/1.2.3 libidn/1.18 libssh2/1.4.2
> Host: it4smbs.com
> Accept: */*
>
< HTTP/1.1 200 OK
< Date: Fri, 10 Feb 2017 18:21:01 GMT
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rkennedy · Post by **rkennedy** » Fri Feb 10, 2017 1:58 pm

The curl looks fine from what I can tell, no issues with SSL.

Looking at the error message you posted -

Code: Select all

HTTP CRITICAL - Invalid HTTP response received from host on port 443: <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">

It would appear the check it attempting to run without SSL, but still against 443, which won't work. I suspect somewhere in the service /command definition there's a -p 443.

If you can't find it, could you post the command definition and service definition for us to review?

DoubleDoubleA · Post by **DoubleDoubleA** » Fri Feb 10, 2017 2:28 pm

You were correct, there was a -p 443. I removed it and it now checks ok.

Thanks

rkennedy · Post by **rkennedy** » Fri Feb 10, 2017 2:31 pm

Great to hear that's what it was! Are we good to mark this one resolved?

tmcdonald · Post by **tmcdonald** » Wed Mar 01, 2017 2:26 pm

Closing.

Nagios Support Forum

Website monitoring conflicting information SSL

Website monitoring conflicting information SSL

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