300-710 Leak Questions

If users report that Cisco Duo 2FA fails when attempting to connect to the VPN on a Cisco Secure Firewall Threat Defense (FTD) device, and the VPN troubleshooting log in FMC shows an error indicating that the Cisco Duo AAA server has been marked as failed, the root cause is likely missing Duo trust certificates on the FTD device. Trust certificates are essential for establishing a secure and trusted connection between the FTD and the Duo authentication service.

Steps:

Obtain the necessary Duo trust certificates.

Install the certificates on the FTD device.

Verify the configuration to ensure that the FTD device can properly communicate with the Duo AAA server.

This resolves the authentication failure by ensuring that the FTD device can trust the Duo server.

Cisco warns that displaying captured packets directly on the screen can degrade system and network performance. The -w test option writes raw packets to a file instead of continuously parsing and displaying them on the terminal. The -s 1518 option sets the snapshot length to the default Ethernet maximum frame size so complete packets are captured, while -c 1000 automatically stops the capture after 1,000 packets. The BPF expression host 10.10.10.10 further reduces resource consumption by capturing only traffic involving the specified host. Options A, B, and C limit the captured traffic to varying degrees, but they omit -w and therefore continue sending decoded packet output to the screen. Consequently, Option D is the complete performance-conscious capture command. Cisco packet-capture procedure