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Cisco ASA-5520 NAT rules gone after software upgrade

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  • Cisco ASA-5520 NAT rules gone after software upgrade

    Hi All,

    After a software/firmware upgrade of my ASA5520 (8.25 to 8.43) Firewall, all my NAT rules, ACL's and Object Groups are gone. I red on the internet that something could go wrong with the NAT rules only, but I didn't expect that eveything would be gone.

    Of course i created a backup of the configuration before the update, but I can't restore it on the new firmware version.

    Is there a solution or workaround for this problem? Or do i have to reconfigure the ASA?

    ~Sven~

  • #2
    Re: Cisco ASA-5520 NAT rules gone after software upgrade

    I have heard numerous issues with the config when doing the upgrade and I think its due to the massive chanages 8.3 and above bring to the ASA. Your core config should be fine such as interfaces, security levels, routing etc. I would bring the old config into notepad and start to copy paste what will work into the ASA. Its good you have a base config to work off of as well. Below is the configuration guide for your platform and how the new network object nat works.


    http://www.cisco.com/en/US/docs/secu..._overview.html
    Last edited by auglan; 23rd May 2012, 11:18.
    CCNA, CCNA-Security, CCNP
    CCIE Security (In Progress)

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