Cisco ASA Audit Event: 109027

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 » 109027: Unable to decipher response message

109027: Unable to decipher response message

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-4-109027: [aaa protocol] Unable to decipher response message Server = server_IP_address , User = user.

Event 109027 is generated when the response from the AAA server cannot be validated because the server key is incorrect. The server_IP_address is the IP address of the relevant AAA server and the user is the user name associated with the connection.

How could you resolve this situation?

Ensure that the server key configured with the AAA server is correct.

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