I recently had a Dell SonicWall soho that I could not get to connect to my dyn account for dynamic IP Address updates.
After searching the Internet I finally called SonicWall/Dell to get support. I was told they would release a hot-fix for me specifically. While the hot-fix did not work for me alone, it was applied when the router started updating so I am not sure if the hot-fix plus the security cert they gave me fixed it or only the security cert. None the less both are available here:
After updating the software and installing the certificate I was able to delete out the dyndns.org information and then readd it to have it correctly update. I’m guessing the dyn.cer file is all that is needed so if you’d like to try that first please do.