The CommuniGate Pro Server accepts SMTP, IMAP, POP, LDAP, and other TCP connections using TCP Listeners. The CommuniGate Pro Server receives SIP, SNMP, RADIUS, TFTP and other UDP requests using UDP Listeners.
A Listener opens one or several listener sockets, each socket accepting TCP connections or receiving UDP packets directed to the specified port number and, optionally, to the specified local IP address.
The Listener settings allow the Server administrator to specify remote address restrictions, providing access to the listener sockets only to the specified networks.
The CommuniGate Pro TCP Listeners can be configured to accept clear text connections or secure (TLS/SSL) connections.
The CommuniGate Pro TCP Listeners can limit the number of incoming connections that come from the same IP address. This can help to prevent certain Denial of Service (DoS) attacks.