Nan, are you talking WPNP or the open nap servers? The WPNP should come up with a few seconds, but the open nap servers are up,down,offline, closed down, membership only, you name it.
They could check with their DSL provider to find if they're blocking file transfer programs due to the traffic they generate.
If they are truely networked and not just through a hub like I do, yes, the network can cause problems. Best results with a network is using the "server" computer. Seems the extra link...DSL to Server to Slave computer causes problems. I just bought a 4 port hub and connect both computers to it and the hub to the modem rather than network the 2 computers.
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