Well I did the factory reset and Nero recognized the 323 right after without any manual entry of my settings into the 323 config. However, once I manually entered my previous settings, the 323 was inaccessible again. So it is something in the settings I am using that is causing the issue.
I suspect it might be the DHCP Client on the 323. Right after the factory reset the 323's DHCP Client is enabled, my settings normally use a static DHCP setting on the 323. That is one difference right there. I'll have to investigate this further.
Any suggestions or comments welcome.