ps ax showed a single [nsd] with status "DW" (that could not be killed), netstat showed a lot of connections to port 80 in status SYN_RECV. there were also still some postgres backends around.
i tried to get rid of the connections by restarting the network, taking down eth0 but nothing worked. (why is that by the way?)
did anyone else have such problems? i would be glad to hear about any experiences with something like that!