No, the network's still up.

Just for the record, the Gnutella network doesn't operate around central servers which could possibly go down and take the network with it. Rather, every client makes a number of other connections to other clients. So, for the entire network to be down, all clients everywhere (roughly estimated at around 300,000 or so) would have to be down at the same time.

As for your connection problem, it does sound like a change was made that may be interfering with your ability to connect to the Gnutella network.