vCloud Director 5.5, Edge Gateway Load Balancing

Hello

I've configured on my vCloud Director 5.5 and Edge Gateway, that load balances two Webservers. On the Tab Pool Servers - configure health check, the monitor Port is on port 80.

When I shutdown both of my webservers, the status on the pool-servers tab is still green (ok). What I'm doing wrong, should I not see an error if all my member servers are not reachable?

Thanks