The value n is the maximum number of ECP clients that can access this system simultaneously. This is the maximum number of connections that this system may accept when acting as an ECP server. If you modify this setting, you must restart the instance for the change to take effect.
0–254 clients. The default is 1 client.
On the page System Administration > Configuration > Connectivity > ECP Settings, in the This System as an ECP Data Server column, edit Maximum number of application servers