Cisco ASA 5505 – ASDM Interface Giving 404 HTTP Error

If you’re getting a:

HTTP: processing GET URL ‘/admin/public/index.html’ from host error from the browser. These are the steps the check.

First run: show flash
You should see the asdm image there.
If you don’t, you’ll need to use tftp and grab the image from another ASA or from Cisco if you have a service contract. Make sure it works with the compatibility matrix: http://www.cisco.com/en/US/docs/security/asa/compatibility/asamatrx.html

Enable mode: en
Configure terminal: config t
make sure the current configuration makes sense: show run http (This is an access list)
enable the server: http server enable
Designate the ASDM image file: asdm image [location of asdm image file]
Write to memory: wr m
Reload: reload

If that doesn’t work the following might help: ssl encryption aes256-sha1 aes128-sha1 3des-sha1

asdm-callhome asdm-icedtea-javaws asdm-launch asdm-login

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