Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

 

Identifying Reasons for Session Close in NSM

 

NSM supports the log reason for the session close feature. NSM displays the reason for session close so that you can differentiate session creation messages from session close messages. If you do not want the reason to display, you can explicitly configure the device not to display the field. Table 1 lists the reasons for session close that NSM identifies. Any session that cannot be identified is labeled OTHER.

Table 1: Session Closings

TCP FIN

TCP connection torn down because of FIN packet.

TCP RST

TCP connection torn down because of RST packet.

RESP

Special sessions, such as PING and DNS, close when response is received.

ICMP

ICMP error received.

AGE OUT

Connection aged out normally.

ALG

ALG forced session close either because of error or other reasons specific to that ALG.

NSRP

NSRP session close message received.

AUTH

Session closed because of authentication failure.

OTHER

Reason for close not identified.