106015: Deny TCP
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-6-106015: Deny TCP (no connection) from IP_address /port to IP_address /port flags tcp_flags on interface interface_name.
Event 106015 is generated when the ASA discards a TCP packet because it had no associated connection in the ASA connection table.
How could you resolve this situation?
This event does not require any action unless the ASA receives a large volume of such invalid TCP packets. If this is the case, trace the source of these packets and determine the reason these packets were sent.