A customer is requesting a way to send a customized reply to users who attempt to access invalid URLs via HTTP and get blocked by the ASA (v9.6). (We are currently using Regex filtering and Botnet Filtering with Static Database). Is this even possible through the ASA? I know there is a similar option with the Access Control Policies in the FirePOWER sensor but this ASA does not have a FirePOWER module.
It does have an old IPS module though.