We have an ISA in a school that has to pass all traffic to the local authority's proxy to get to the internet. We do that in the web chaining rule. The local authority have created a website on their LAN that the school needs to get to - i.e. between the ISA and the proxy. What we need is a bypass to the web chaining rule for one site only. The exception part in the chain doesn't seem to help us.
How would we go about doing that?
Additional info: If we put a laptop on the WAN side of the ISA and configure the proxy in IE to use the proxy but with an exclusion for the Local Authority URL then we can visit the site.