This issue could be related to multiple aspects of your configuration or hardware. I'll provide a few steps that you can follow to try and troubleshoot the issue:
1. Check the physical connection: Ensure that the management interface is physically connected to the correct port on the FPR1120 and the other end is connected to a switch or computer that is properly configured. Verify the cable being used is in good working condition.
2. Verify interface configuration: Double-check the configuration of the management interface on the ASA to ensure it's correctly configured with the right IP address, subnet mask, and other attributes. You can do this by entering the following commands in configuration mode:
interface management0/0
ip address (ip_address) (subnet_mask)
no shutdown
Replace `(ip_address)` and `(subnet_mask)` with the appropriate values for your network.
3. Check VLAN configuration: If you are using VLANs in your network, make sure the management interface is assigned to the correct VLAN, and the switch port it's connected to is configured accordingly. You can check the VLAN assignment on the ASA with the following command:
show vlan
4. Verify security settings: Ensure that the management interface is configured to allow the necessary management traffic. You can check the security settings on the ASA with the following commands:
http server enable
http (ip_address) (subnet_mask) management0/0
Replace `(ip_address)` and `(subnet_mask)` with the appropriate values to allow access from the desired IP range.
5. Test connectivity: Use the `ping` command from the ASA to test connectivity to another device on the same network as the management interface:
ping (ip_address) interface management0/0
Replace `(ip_address)` with the IP address of the device you're trying to reach.
If you still can't connect to the management interface after following these steps, I suggest reaching out to Cisco TAC for further assistance, as this could be a hardware issue or a bug in the software version you're running.
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