Having same problem here.

Model: Data Storage Software V6
Version: 6.0up97.8101.6335 64bit
Release date: 2012-06-22

I disabled / enabled Apache Server from the Tools Menu.
Tried the time / cert suggestion the other user tried.

A reboot will always fix the problem, just not sure how long it takes for the Apache server to stop responding.

Any other suggestion would be great.

Thanks

Jim Lund