In SSL Certificate module you have the option to test if your SSL Certs are working well.
There are 4 test buttons there.
Testbutton 4 is linked to sslcerty.com . i just found out this domain is no longer being hosted and working. when looking up on isdown . com it says the domain is parked or for sale.
So maybe the programmers can take the button away or replace it with a link to another test site ?