HTTP server demo not accepting connections

The eth0 settings are set in the nios2configtool, though configuring it for DHCP worked the same way.

We use the 10.x.x.x range for internal IP addresses, and the second octet is based on the department. 10.4.x.x is the IT department, 10.8.x.x is mine. All my incoming connection attempts were from 10.8.x.x addresses. I didn't know what it was asking for for "Server IP address for 'eth0'", so I put in the IP of one of our nameservers.

Anyway, this morning it's decided on a new behavior. It accepts connections and replies to pings after the "recvfrom: Operation timed out", but the HTTP server doesn't return any data; it just leaves the connection open. I'm wondering if it got killed when the ping test ended...