I think the problem is that probably used the following url:
https://voxalot.com
instead of:
https://www.voxalot.com
Our SSL certificate is registered with *.voxalot.com (as you can see from the error message that Firefox gives), which doesn't match the
https://voxalot.com url.
I have been thinking about redirecting
https://voxalot.com users to
https://www.voxalot.com for a while now, but just haven't had a chance to test it properly.
--
Craig