We signed up for load balancing and set up a simple scheme with two backend servers. We first tried with a health check that would detect the closing HTML in the monitored URL. It would always detect the server as down, we them removed the string check and left a simple HTTP check, which is always reporting both of our servers as down too.
We thought we would have done something wrong, so we checked every value. There doesn’t seem to be much places where you can input a wrong value, as input is validated. Both of our HTTP servers are up and responding to users and our checks.