I have started getting the 404 Not Found error too. I found that this URL works for me (replace with your S2 IP address):
http://192.168.1.99/index.htmlWow, nice work. How the hell did you figure that out? that's great news.
I don't currently have this problem, but it's probably coming, so it's sure nice to have this solution on deck.
If you figure out an explanation, please do share.
See my reply above - I was assigning my S2 the same IP address as a PC on my network... D'Oh!
I figured out the URL by SSHing onto my S2 (somehow I got on... not sure how with my router in conniptions with an IP address conflict).
I found the directory /www/pages which has the files:
administration.html
cgi-bin
css
dav
images
index.html
js
kernelLog.html
minerConfiguration.html
minerStatus.html
monitor.html
network.html
networkDiagnostics.html
reboot.html
resources
type
upgrade.html
So I tried accessing a page directly, e.g.:
http://192.168.1.99/index.htmlhttp://192.168.1.99/minerConfiguration.htmlAny of the above should work