Cisco ASA Audit Event: 305016

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.

Cisco ASA Auditing Tool

EventLog Analyzer is a comprehensive log management software with which you can centrally collect, analyze, and manage logs from all the different log sources in your network. You also get reports and alerts on your network security, making it a power-packed IT security tool.

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