Log file

I have a ASA 5505 firewall.   I use point to point as well as remote access VPN.  How can I tell when a user logs in and out of the VPN?
Tim DawsonIT ManagerAsked:
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Jan SpringerCommented:
I configure syslog on the ASAs to point to linux servers just to troubleshoot or track any problems.  The logs will show VPN logins.
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Henk van AchterbergSr. Technical ConsultantCommented:
http://informationsecuritytips.com/2010/09/configuring-cisco-asa-firewall-to-email-critical-log-events/

Cisco ASA firewalls can be configured to send logs via email, this could be used be used for all event types but unless you dont mind getting spammed use it for receiving alert or critical events only.

example:

logging enable
logging timestamp
smtp-server 172.16.1.XX
logging mail  alert
logging from-address ASA@domainame.com
logging recipient-address asa-admin@domain.com level alert

If you would like to be alerted only when certain critical messages are generated then you should create a logging list and then associate it with the logging mail command as shown below

logging enable
logging timestamp
smtp-server 172.16.1.XX
logging list critical-events level critical
logging list critical-events message 201003
logging mail critical-events
logging from-address ASA@domainame.com
logging recipient-address asa-admin@domain.com level critical

A list of syslog messages:

http://www.cisco.com/en/US/docs/security/asa/syslog-guide/logmsgs.html
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