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After max_connect_errors  successive connection requests from a host are interrupted without a successful connection, the server blocks that host from further connections. If a connection from a host is established successfully within fewer than max_connect_errors  attempts after a previous connection was interrupted, the error count for the host is cleared to zero. To unblock blocked hosts, flush the host cache; see Flushing the Host Cache. 

• max_connections 

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The maximum permitted number of simultaneous client connections. For more information, see Section 5.1.12.1, “Connection Interfaces” . 

• max_delayed_threads 

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