SSL monitor cPanel DNS only server with Nagios

I have installed a certificate for the cPanel DNS Only webinterface (WHM). And I have a Nagios server which I want to use to monitor the certificate so I get alerted when it's about to expire.

That is no problem for a normal cPanel server but it doesn't seem to work on a DNS only server. This is my command:

Code:

define command {
  command_name  check_ssl_expiry
  command_line  $USER1$/check_http -H $ARG1$ -S --sni -f follow -C 14,7 -p $ARG2$
}

And this is my service definition:

define service{
  use  generic-service-daily
  host_name  ns1.example.net
  service_description  Certificate ns1.example.net
  check_command  check_ssl_expiry!ns1.example.net!443
}

The server doesn't seem to respond at port 443, anyone got a suggestion on how to solve this?

 

Tried port 2087 instead now but that doesn't work either. All I get is a socket timeout message in Nagios.

 

Oh yeah, stupid me. Forgot to open port 2087 on my Nagios server, everything works now!