Cisco ASA Audit Event: 305016

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 » 305016: Unable to create connection

305016: Unable to create connection

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-3-305016: Unable to create protocol connection from real_interface: real_host_ip /real_source_port to real_dest_interface: real_dest_ip / real_dest_port due to reason.

Event 305016 is generated when the maximum port blocks per host limit is reached for a host or the port blocks have been exhausted. The reason is specified in the message.

How could you resolve this situation?

If the reason is reaching the per-host PAT port block limit, review the maximum blocks per host limit by entering the 'xlate block-allocation maximum-per-host 4' command. If the reason is port block exhaustion in the PAT pool, increase the pool size. Also, review the block size by entering the 'xlate block-allocation size 512' command.

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