More specifically, you can use the nagios check_ssl_cert plugin [1], which checks if the server is running and delivers a valid certificate. We use this plugin

More specifically, you can use the nagios check_ssl_cert plugin [1], which checks if the server is running and delivers a valid certificate. We use this plugin extensively and it takes the surprise out of an expired ssl cert. You will get multiple heads up, say 90, 60, and 30 days out (it's configurable), that your cert is going to expire. Seems like a no brainier. [1] http://exchange.nagios.org/directory/Plugins/Network-Protocols/HTTP/check_ssl_cert/details http://exchange.nagios.org/directory/Plugins/Network-Protoco...