The MaxClients property specifies the maximum number of
client connections that will be accepted by the server. Once the
maximum number of connections has been established, the server will
reject any subsequent connections until the number of active client
connections drops below the specified value.
Changing the value of this property while a server is actively
listening for connections will modify the maximum number of client
connections permitted, but it will not affect connections that have
already been established. You can also use the Throttle method
to change the maximum number of guest users, the maximum number of clients
per IP address and the rate at which clients can connect to the
server.
It is important to note that regardless of the maximum number of
clients specified by this property, the actual number of client
connections that can be managed by the server depends on the number
of sockets that can be allocated from the operating system. The
amount of physical memory installed on the system affects the number
of connections that can be maintained because each connection
allocates memory for the socket context from the non-paged memory
pool.
The default value for this property is 100 active client connections.