Is software & licensing still available for Gateway Security 5420 appliance?
Unfortunately there was an EOL issued for SGS applainces. You can find yours on the list in the following URL: http://www.symantec.com/business/support/index?page=content&id=TECH89655
Your appliance was EOL as of 10/19/2006 and no support ofter 12/29/2009. I personaly have tried to renew licensing for SGS appliances.... impossible sadly. They are great appliances to reuse as an opensouce FW or antispam appliance. If you want to possibly risk security issues, the .slf file will unlock FW/IDS/SPAM etc.... but liveupdate is null. Hopefully you still have the original media kits for O/S load or reload as Fileconnect no longer has the software, you can find a few updates here: ftp://ftp.symantec.com/public/english_us_canada/products/symantec_gateway_security/
Hope this helps.
Adam St. George