Network Binding Dialog Box

The options are:

Listening address	Specifies the server IP address. By default the server is set to listen on any available address. Use :: to listen to any available IPv6 address. Use 0.0.0.0 to listen to any available IPv4 address. To configure the server to listen on a specific interface, enter the IP address into this text box. The address must be a valid network address for this computer. NOTE:You need to restart the server after changing this setting.
Port	Specifies the port on which the server listens. The default is 22, which is the standard port for Secure Shell connections. NOTE:You need to restart the server after changing this setting.
Client keep alive	Use this setting to close client sessions that have become unresponsive. When this setting is selected, the server sends a keep-alive packet through the Secure Shell channel to any client that has been idle for the specified number of seconds. If the server receives no response, it closes the client session.
Require reverse DNS lookup	When a client initiates a connection, the server always tries to resolve the client domain name. When Require reverse DNS lookup is selected, the server refuses connections from clients whose domain name cannot be resolved. NOTE:Enabling this setting may cause authentication failures in some networks. Do not enable it unless you have confirmed that your DNS can successfully resolve the names of all clients who should be allowed to connect.