SQLNET

sqlnet.inbound_connect_timeout = 600

10 MINUTOS

#Possible values: 0-any valid positive integer (in seconds)
#Default: 0
#Recommended value: 3 seconds (note: this is highly application dependent)
#
#Purpose: Indicates the time interval within which database authentication
# for a client must be completed. If the client fails to complete
# authentication within the given time period, then the database
# server will drop the client connection. This can be used to
# counter Denial of Service attacks in which malicious clients may
# cause numerous servers to be spawn without fully establishing DB
# sessions.
#
# A value of 0 turns off the timeout feature. If a spurious
# timeout error occurs (e.g. due to a slow network/system),
# reconfigure this parameter to a larger value.
#
#Supported since: v9.2
#