2013/10/27 - Proxy problems continue
The problems discussed in continue -- about fifteen minutes ago, both of the University's proxy servers stopped responding. This will have resulted in an apparent Internet outage, as most websites would have been inaccessible. One of the two is now responding, and the other is in the process of rebooting.

Unfortunately the cause of this is not understood. It would seem that it is not the network cards, as previously thought. Until it is, it is likely to recur.
This problem is still periodically recurring, about once a day. Each time it does, we try something different to resolve it. However, at this stage, we're grasping at straws -- there are no errors logged when this happens, and nothing whatsoever to indicate why it is happening.