When there is a need to forward traffic from downstream Proxy to upstream Proxies and load balance those connections.
To configure the Downstream Proxy to send to one or multiple Proxies upstream we will first start with creating the Forwarding Hosts to be used. Forwarding to upstream Proxy/Proxies will be an Explicit Connection.
All new traffic will evaluate the rule and be load balanced to the Forwarding Group.
There will be Policy and connections going to the upstream Proxy that might need to be added/modified to allow these explicit connections from the downstream Proxy/Proxies.
Packet Captures and Policy Traces on Both Proxies might be needed to make sure what type of policies are needed. Please contact support if you have any issues or question