Detect talkd server port and protocol version

The remote host is running a 'talkd' daemon. talkd is the server that notifies a user that someone else wants to initiate a conversation with him.
Disable talkd access from the network by adding the approriate rule on your firewall. If you do not need talkd, comment out the relevant line in /etc/inetd.conf and restart the inetd process.