To make permanent the change you have to:
– copy your modified version of the file with
cp /root/kerbynet.cgi/template/havp.config /Database
– In the section [Setup][Startup] add the following line to the [Pre Boot] script:
cp /Database/havp.config /root/kerbynet.cgi/template
– Enable Pre Boot script by clicking on the [Enabled] flag.
I don’t like a network in which the users must change their browser configuration to use the proxy with the antivirus. I prefer the transparent mode in which any http request is automatically redirected to the proxy and the result scanned by ClamAV.