If only a server name is specified, clients try to connect to that server by scanning for an SLM instance in the port range 27000-27009, waiting up to 100ms for a response on each port. If no response is received within that time, the next port is probed. Should a delayed response from a previously probed port come in after the timeout has expired, that response will get ignored as the SLM client has moved on to try the next port(s).
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