I am having a similar problem as some of you. I cannot get to the web interface after upgrading to 2.00.08 on my 5200.
I am using 1 Vista Ultimate 64-bit and 2 XP pro boxes.
I can ssh using puTTY and WinSCP, but I can't get to the web interface. I get a 404 error both for http and https. It really is kinda annoying.
I also have another problem where I cant create new objects, rename existing objects in the shared drives I have mapped. It tells that access is denied. This is the same for all OSes
It does it even if I connect using sys. But it is very erratic. Sometimes I connect and it is fine, other times it isn't.
Is there a place to set permissions from the command line that will work? All of my shares seem to have the right 777 permission, but is there something higher up in the directory structure that may be stopping me? Something in /raid0 or something?
I have rebooted the server and reset factory defaults, but it seems to do the same thing every time. Maybe I should downgrade my firmware. Can that be done?
The web interface on my N5200 disappeared, too, though I didn't have all the other symptoms you report. I fixed it my restoring the httpd.conf file from a backup I found in the same directory, /etc/httpd/conf/. It might be your problem, too. You never know.