Enter the enable command to enter Privileged Mode.When it finishes booting, you should see the default prompt: The appliance bypasses its startup configuration.Reboot the appliance with the boot command:.Change the Configuration Register to 0x41, which causes the appliance to bypass its saved config at boot:.Answer no when it asks you if you want to change the Configuration Register setting. The appliance will most probably have the default Configuration Register setting of 0x01.Enter the confreg command to view the current Configuration Register setting:.Watch the boot progress, and when prompted, press Esc to interrupt the boot and enter ROM Monitor mode.Power cycle the appliance – flick the power switch on the front off and on again.You will need to stop the boot process early on, so you don’t want to be messing about trying to get the console to work while it’s booting, or you’ll miss your prompt, and have to start again. Connect your console cable and make sure you can see the command prompt for the ASA – even if you can’t log in.Once in we can erase the saved config (or just reset the password if you want the config) reset the configuration register to it’s original value, and reboot the appliance – simple! The appliance then boots with a minimal basic configuration, and crucially for our needs, bypasses the unknown passwords allowing us in to reconfigure it. We then change the configuration register, to force the appliance to ignore it’s saved config. In brief, this process involves booting the appliance, and then interrupting the boot process part way through. Although, as the configuration that’s already there was of no use to me, I just removed the config entirely. So, I needed a way to get into the ASA, and reset the password. So I had a perfectly functional firewall, but no way to reconfigure it to my needs. The scenario: I recently acquired a used ASA 5510 from another internal department, but the login details had been lost along the way. This post is part of a series on configuring Cisco ASA 5510 firewalls Please browse our website to see what we offer – thanks, and enjoy the blog We cover Derby and Derbyshire, Nottingham and Nottinghamshire mainly, but do also have clients further afield. When we come across issues that would be useful to others we “try” to post the answers on our website –. We spend all of our time with clients, helping them to make good decisions about their IT. Binary Royale is an IT consultancy company based in the East Midlands.
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