Hi guys, I have the same problem with a DNS-327L.
The problem is exactly the one descripted by zemops; I can access the NAS through the Android App, using the web interface when connected to the LAN or mounting it as a network drive.
When logging in to the website I can see the device as found, but I cannot manage to get to browsing the files, it hangs in the same point that zemops said.
I tried at home/work with Chrome/Firefox on Windows and on Chrome on Ubuntu.