This log entry is made by the FTP daemon when it accepts a client connection request. The keyword CONN identifies this entry as a connection log entry.

sessionID uniquely identifies the FTP session between a client and a server. The identifier is created by combining the jobname of the FTP daemon with a 5-digit number in the range 00000–99999. This identifier is in each log entry for the session until message EZYFS52I, which is the last entry for the session.

ipaddr is the IP address of the FTP client. The IP address might be either an IPv4 or an IPv6 address.

hostname is the name of the FTP client. If the name cannot be resolved, UNKNOWN is displayed.