I recently set up DynDNS.org on my home network so that I could always have a way to reach my computer despite my ISP's dynamically assigned IP.

I've tried VNC, Remote Desktop, etc. using my new DynDNS domain name and it works. I also use Remote HotSync with my Treo. Under Primary PC Setup I entered my DynDNS domain and the Treo is unable to connect to my computer. When I enter the numerical IP address, I am able to connect and HotSync.

Any idea why HotSync won't work with an alphabetical domain address rather than a numerical IP?