Server System Variables 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 Dynamic Yes SET_VAR  Hint Applies No Type Integer Default Value 100 Minimum Value 1 Maximum Value (64-bit platforms) 18446744073709551615 Maximum Value (32-bit platforms) 4294967295 The maximum permitted number of simultaneous client connections. For more information, see Section 5.1.12.1, “Connection Interfaces” . • max_delayed_threads Command-Line Format --max-connections=# System Variable max_connections Scope Global Dynamic Yes SET_VAR  Hint Applies No Type Integer Default Value 151 Minimum Value 1 Maximum Value 100000 Command-Line Format --max-delayed-threads=# Deprecated Yes System Variable max_delayed_threads Scope Global, Session Dynamic Yes SET_VAR  Hint Applies No Type Integer Default Value 20 Minimum Value 0 829