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You can not do content filtering with ASA firewalls with IOS. You will need to buy a content filtering solution, or sign up for a inexpensive content filtering with OpenDNS.org. This is a good content filtering basic system with white and black listing capability.
If you want to block all web traffic, a straightforward rule preventing HTTP traffic (TCP port 80) as well as HTTPS (port 443) will block any and all web access.
If you just want to block specific sites, I'd recommend an access control list (ACL) configured to deny traffic to those specific site's IP addresses.
1. Copy the config and IOS image to a tftp server. 2. Format flash (disk0) 3. set rommon server, ip addy, and file settings. 4. tftpdnld 5. Once the system has booted to the image copy the asa image file, asdm image file, and config to flash 6. configure asdm image default location and reload
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