1. Open the license file using the notepad to check the firewall ESN and LAC. No error is found.
2. Check the license status. The license status is active.3. Run the display firewall mode command to check the firewall status. The firewall is working in transparent mode. The ipsec commands are available only in routing mode.
1. The ESN or LAC is incorrect.
2. The license status is incorrect.The firewall working mode is incorrect.