OS X Safari Comodo SSL issue
I can't reproduce this issue with Safari 9. By visiting Skiplex UK everything loads correctly without a SSL cert error. 

Here’s what you can do:


Ty clearing your Safari Cache and Cookie
Open Keychain Acccess and select Keychain First Aid > Select „Repair“ > Start 
Reboot your Computer.


This sites covers your issue in more detail. http://osxdaily.com/2014/03/26/fix-safari-cant-verify-website-error/