how configure shared frontend with two backends
I have one public IP that has some names configured.
And I have two local servers that play the services.
At the backend, I configured one server to 192.168.1.71 and another backend to IP 192.168.1.87 both at 80 port.
At the frontend, I configured shared front end
Put all name on access control lists with the expression "Host matches:" cs = no not = no
Value = domain address.
In the actions section, I configured two Backend.
If I set both backends at the same time, only services that run at backend 192.168.1.87 works.
If I set the backend 192.168.1.71 as the default Backend, just the services which run at backend 192.168.1.71 works.
The HTTP error at the services don´t work is 503
How I set the frontend all services in both backends work properly?
Thanks for help.