Showing results for 
Search instead for 
Did you mean: 


Cisco ASA 5505 hangs after loading image

This morging (without changing anything recently in the ASA) the Cisco ASA wasn't working anymore.

When I connect with the ASA thrue the console, It's booting, but when loading the ASA Images, it hangs.

This is what happens during boot:

Embedded BIOS Version 1.0(12)13 08/28/08 15:50:37.45

Low Memory: 632 KB
High Memory: 507 MB
PCI Device Table.
Bus Dev Func VendID DevID Class Irq
00 01 00 1022 2080 Host Bridge
00 01 02 1022 2082 Chipset En/Decrypt 11
00 0C 00 1148 4320 Ethernet 11
00 0F 00 1022 2090 ISA Bridge
00 0F 02 1022 2092 IDE Controller
00 0F 03 1022 2093 Audio 10
00 0F 04 1022 2094 Serial Bus 9
00 0F 05 1022 2095 Serial Bus 9

Evaluating BIOS Options ...
Launch BIOS Extension to setup ROMMON

Cisco Systems ROMMON Version (1.0(12)13) #0: Thu Aug 28 15:55:27 PDT 2008

Platform ASA5505

Use BREAK or ESC to interrupt boot.
Use SPACE to begin boot immediately.

Launching BootLoader...
Boot configuration file contains 1 entry.

Loading disk0:/asa823-k8.bin... Booting...

I allready tried to restore (another) image thrue rommon with like bellow:

  • Connect a console cable from the ASA to your computer and open up a serial connection using Putty
  • Disable any software firewall on your computer
  • Install TFTP server software on your computer – I used Solarwinds TFTP server
  • Place the Cisco software image in the TFTP-Root folder (asa821-k8.bin) and start the TFTP service
  • Assign a static IP address to your computer – I used (an address outside of my existing subnet)
  • Connect an Ethernet cable between your computer and port 0/0 on the ASA
  • Power off the ASA then power it back on
  • Press the escape key to boot into ROMMON mode
  • Enter the following commands in the ASA (the first part of these commands must be in caps)

    rommon #1> ADDRESS=
    rommon #2> SERVER=
    rommon #3> GATEWAY=
    rommon #4> IMAGE=asa821-k8.bin
    rommon #5> PORT=Ethernet0/0

  • These commands assign an IP address of to port 0/0 on the ASA and tell it to look at your TFTP server and to select the ASA software image.
  • Next, execute the command to transfer the image from the TFTP server to the ASA

    rommon #6> tftp

Is my ASA broken ?

Thanks for the help


When you boot from rommon via a tftp server, the image is not written to flash. So even if you had a flash problem, it should still be able to boot from rommon. You may have another issue with the ASA hardware, but usually if there is a memory/cpu/mainboard problem then the ASA won't load rommon either.

When you attempted to boot from rommon, did your tftp server software indicate that the file was sent? Did it look like the ASA was able to communicate with the server at all? Make sure that any local firewall software is disabled on the tftp server. I would also try another port on the ASA just to be certain.



The image was transferred succesfull then Rommon seas loading tftp image and again it hangs.

Content for Community-Ad