In BETA-2 i used to be able to set a monitor ip under Load Balancer: Pool: Edit in BETA-4 this field is greyed out. If i click on gateway instead of server in the pull down menu type i can set a monitor ip. Is the correct? Have you changed this setting. I upgraded from Beta-2 to Beta-4 and restored my old settings everything else seems to work.
Monitor is only used for gateway type pools. Server pools use the server address and port you put in the pool. For gateways, you may not actually want to monitor the gateway itself, so we provide a monitor ip field so you can choose a different IP to ping. And yes, b2 -> b4 had numerous LB related changes.
–Bill