My WIFI cameras keep getting "attempted hacks" notices, why?

I have a d-link DCS-936L and a d-link DCS-5030L both of which are wifi cameras and for whatever the reason, the Xfi app keeps telling (the moment I connect them to my network) me that there has been 1  or 2 (I've seen u to 50) "Unauthorized Access Attepts" all from port 80 and all from different countries, i.e. Russia, Thailand, Iran. What can i do to fix this problem? can I chnage port 80 and if so, to what? i do have access to the cameras network settings where I can change the Port settinngs.