Server identity problem

Server identity problem

Hi, my site is now live (www.out-of-time.co.uk) but when I try and go through checkout I get an issue with the server identity. In Safari the message is "cannot verify server identity... would you like to continue anyway?" In Chrome it sounds much more serious and is bound to put people off using the shop.

Could you advise please on what might be causing this - perhaps I have some settings wrong?

Thanks in advance for your help,
Naomi

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Aw: Server identity problem

Configuration / general
Use SSL: N

Aw: Server identity problem

Thanks!
Naomi