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1) It's expected to fail to bind a new source port when they are scarce, suppress warning in log in this case. 2) Optimse bind_local when max_port - min_port is small. There's no randomness in this case, so we try all possible source ports rather than poking at random ones for an arbitrary number of tries. 3) In allocate_rfd() handle the case that all available source ports are already open. In this case we need to pick an existing socket/port to use, such that it has a different port from any we already hold. This gives the required property that the set of ports utilised by any given query is set by --port-limit and we don't re-use any until we have port-limit different ones.