The <system.net> child of <configuration> section in machine.config, or the application or assembly .config file is used to configure the System.Net namespace.
<configuration> <system.net> <connectionManagement> ... </connectionManagement> </system.net> </configuration>
Inside a connectionManagement section, you can have the following tags:
<connectionManagement> <add name="address" maxconnection="NN"/> </connectionManagement>
Where the address is the host name, or the wildcard "*" to apply to all connections. And maxconnection is the maximum number of open connections on that host.