It will also happen when the remote host is very busy. - The LimeWire team could write a workaround for this by retrying hosts although the connection has failed. BearShare does so but for certain reasons LimeWire chose not to do that because of a (in my opinion very remote) possibility of being used for DDoS attacks.

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Morgens ess ich Cornflakes und abends ess ich Brot
Und wenn ich lang genug gelebt hab, dann sterb ich und bin tot

--Fischmob