A local DNS server resolves <hostname> to a correct IP4 and/or IP6 address.
Connecting to a normal website / wiki is fine with either IPv4 or 6; Logging in to the firewall as administrator is also OK using either protocol.
However, when I try to log in to a Synology NAS unit (the url typed in is "fileserver:5000"), with an IP4 address it works perfectly, but when I use a IP6 address I see the error:- filtered by ABE <LOCAL> Deny
I am running Firefox 25.0 and Noscript Ver 2.6.8.40 on a Mint 12 system the most recent versions my PC will support

There doesn't seem to be a method of whitelisting an IPv6 subnet... Any ideas?
Allen C