As a workaround, copy and paste the URL into a alternative web browser, such as Google Chrome, or Mozilla Firefox. Both of which are free. This should allow you to authorize Photo Via.
This error applies to Mac OS X 10.8.5 and Safari 6.2.8 when you attempt to authorize Photo Via. This version on Mac OS X and Safari does not support our updated version of TLS (Transport Layer Security) protocol. This workaround might also apply to if you're having problems attempting to authorize.