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Cisco ASA: “read-only file system”

March 21, 2012
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Recently, while upgrading a Cisco ASA that belongs to a customer and hasn’t been touched in a long time, the following took place: ciscoasa# copy tftp flash Address or name of remote host []? 10.10.10.42 Source filename []? asa842-k8.bin Destination filename [asa842-k8.bin]? Accessing tftp://10.10.10.42/asa842-k8.bin…!!!!!!!!!!!!!!!!!!!!!!! … Writing file disk0:/asa842-k8.bin… %Error opening disk0:/asa842-k8.bin (Read-only file system) ciscoasa# […]

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How To Upgrade Cisco ASA Software And ASDM

February 15, 2012

After writing about how to upgrade a Cisco ASA license, I received a few messages asking about upgrading the Cisco ASA software. Fortunately, just like upgrading IOS on a Cisco router, it’s an easy, straightforward process that you can knock out in a few minutes. In this walkthrough, we’ll be upgrading the the ASA software […]

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How to Upgrade the License on a Cisco ASA

December 16, 2011
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The different licensing “levels” available on the Cisco Adaptive Security Appliances allow an organization to buy only what they need while retaining the option to upgrade in the future, if necessary. For example, a small business with 15 employees may start out with a Cisco ASA 5505 with a 25-user (or, more correctly, 25-host) license. […]

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