I come here in response to an email. I have not used any other camera other than the dcs932l, nor have I used the email notification. What I can suggest for you to check:
-on your router, look under networking. Take note of the addressing range that your routers uses to supply dhcp addresses to devices connected to it. For ex. it might be something like: starting address = 192.168.0.100, with a range of about 50 or perhaps 100, making the ending address of 192.168.0.150 or perhaps 192.168.0.200. Now log onto your camera, and under networking, assign a static IP address to your camera OUTSIDE of the addressing that your router assigns (above). For ex. you might choose 192.168.0.50 or perhaps 192.168.0.225. Note that 192.168.0.255 is the maximum value allowed. What ever it the address you choose, that is the address that you must use in your router if you wish to use port forwarding (from the router to the camera). Not saying that you want to do this; probably not, but just saying. Remember to SAVE the settings before you log out.
As for the TLS problem...I do believe that dlink and others had some security issues in the last year, and perhaps that might have ramifications for you. It was the main reason for a software upgrade last year. You might look into that. I imagine FurryNutz might offer you some enlightenment there.
Best regards,
Bob