Cisco ASA Audit Event: 108007

108007: TLS started on ESMTP session between client and server

Cisco ASA is a security device that provides the combined capabilities of a firewall, an antivirus, and an intrusion prevention system. It also facilitates virtual private network (VPN) connections. It helps to detect threats and stop attacks before they spread through the network. 

Message: %ASA-6-108007: TLS started on ESMTP session between client client-side interface-name : client IP address /client port and server server-side interface-name: server IP address /server port

Event 108007 is generated when a server responds with a 220 reply code to the STARTTLS command by the client on an ESMTP command. The message contains:

  • The client-side interface name.
  • The client IP address and port number.
  • The server-side interface name.
  • The server IP address and port number.

How could you resolve this situation?

Check whether the ESMTP policy map associated with that connection has the allow-tls action log setting. If not, contact the Cisco TAC.

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