In older versions of versions of squid, you had to define an acl 'all'.
acl all src 0.0.0.0/0.0.0.0
You use this for http_access allow all http_access deny all etc.
In Squid 3.0 and above, the 'all' ACL is built-in, you cannot (& need not) define it.
However, the webmin squid module doesn't seem to know this - when you try to add a rule using all, it doesn't show 'all' in it's list of ACLs.
How does one get around this?
I am using webmin 1.530 on Debian Lenny. Squid Version is 3.0.STABLE19-1~bpo50+1