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Because we set SO_REUSEADDR on sockets for host ports, if there are port mappings for INADDR_ANY (the default) as well as for specific host ports - bind() cannot be used to detect clashes. That means, for example, on daemon startup, if the port allocator returns the first port in its ephemeral range for a specific host adddress, and the next port mapping is for 0.0.0.0 - the same port is returned and both bind() calls succeed. Then, the container fails to start later when listen() spots the problem and it's too late to find another port. So, bind and listen to each set of ports as they're allocated instead of just binding. Signed-off-by: Rob Murray <rob.murray@docker.com>