Cisco ASA Audit Event: 106001

Cisco ASA Events

The logs of network perimeter devices such as firewalls, antivirus applications and intrusion prevention systems contain crucial information that helps to pre-emptively block security attacks and breaches. Hence, it's mandatory for you to monitor and audit these logs. Because Cisco ASA provides the combined functionality of all the three, it becomes all the more important to monitor its logs. 

ManageEngine's EventLog Analyzer, a comprehensive log management solution, collects and analyzes the log data from Cisco ASA devices, triggers alerts and generate reports on detected security incidents thus helping you to take suitable measures against security threats, if any. 

Cisco » 106001: Inbound TCP connection denied

106001: Inbound TCP connection denied

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-2-106001: Inbound TCP connection denied from IP_address/port to IP_address/port flags tcp_flags on interface interface_name.

Event 106001 is generated when an attempt to connect to an inside address is denied by the security policy that is defined for the specified traffic type. The source and destination IP addresses and port numbers, the TCP flags, and interface name are specified in the message. The possible TCP flags are:

ACK - The acknowledgment number was received.

FIN - Data was sent.

PSH - The receiver passed data to the application.

RST - The connection was reset.

SYN - Sequence numbers were synchronized to start a connection.

URG - The urgent pointer was declared valid.

How could you resolve this situation?

This event does not require any action.

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