Pool down even Node is up

Hi,

I don't know if this how F5 behaves, but we have a pool have a health monitor of gateway_icmp and pool members are using port 443:

ltm pool FEMA_WFO_POOL {

  description FEMA_WFO_POOL_HTTPS

  members {

    USDEN-WFMFEMA3:https {

      address 170.65.231.131

      monitor FEMA_https 

      session monitor-enabled

      state down

    }

    USDEN-WFMFEMA4:https {

      address 170.65.231.132

      monitor FEMA_https 

      session monitor-enabled

      state down

    }

    USDEN-WFMFEMA5:https {

      address 170.65.231.133

      monitor FEMA_https 

      session monitor-enabled

      state down

    }

  }

  monitor gateway_icmp 

}

As you can see it uses gateway_icmp but the port is 443. Port 443 is down on the servers as per my telnet test. But I don't know why it is being marked down by the monitor, it is not a tcp monitor but gateway_icmp (which i believe it doesnt care of the port - only ping)

Here is the nodes (gateway_icmp) healtcheck too:

ltm node USDEN-WFMFEMA3 {

  address 170.65.231.131

  description USDEN-WFMFEMA3

  session monitor-enabled

  state up

}

ltm node USDEN-WFMFEMA4 {

  address 170.65.231.132

  description USDEN-WFMFEMA4

  session monitor-enabled

  state up

}

ltm node USDEN-WFMFEMA5 {

  address 170.65.231.133

  description USDEN-WFMFEMA5

  session monitor-enabled

  state up

It is up. So what's happening here? or what should i change? Is this a bug?

I already tried removing the gateway_icmp then adding it again, but same status.