sandbox secure connection issue

[Senthilmuga]

www.sanbox.paypal.com/cgi-bin/webscr?cmd=_notify-synch&tx=[transaction id]&at=[PDT token] request failed in my auto-return page

due to security issue. how to get pdt information..is there any way?

Thanks..

[Quandary]

You may want to redirect your question to the Merchant Tech Support community.