I recommend you upgrade to the latest FW.
Use IE or FF and disable any browser add-ons and PC security programs before starting this.
Download the FW file and unpack the .zip file.
I recommend using a LAN wired connection from the camera to the main host router for this. Unless you are sure you have a GOOD wireless connection between the main host routers wifi and the camera, use LAN wired.
Factory reset, log into the cameras web page and use the cameras web page to upload the .bin FW file.
Clear out any browser caches then close the browser then reopen.
Factory reset once more then set up from scratch.
You shouldn't see any Certificate messages.