Why can't I execute the FTP transmission successfully? How to avoid this?

Zyxel_Jeff

Scenario :

The customer may encounter a situation where they cannot execute the FTP transmission successfully. What are the possible causes and how can they avoid it?

Answer :

The possible reason is caused by "ICMP Unreachable", as shown in below :

The user can issue CLI commands to disable icmp-destroy-session to avoid this.
Router> configure terminal
Router(config)# firewall icsa icmp-destroy-session disable
Router(config)# write

Router>show firewall icsa status
The Firewall ICSA PATCH switch
ICMP Destroy Session: Off