[system test] web console down after failover out from cluster

Do system test on windows in ec2
Environment: Windows 2008 R2 64bit in EC2
Total instants: 8
Cluster info:
* 6 nodes cluster
* one default bucket with size 12GB RAM per node
* Load 48 million items to cluster with size from 128 to 512 byte.
* Create one doc with 2 views

Do add in, remove and failover test.
The last failover test, failover node kicked out of cluster but its web console is down. I see erl process is still running.
Failed node is still in fail state at ec2-174-129-127-132.compute-1.amazonaws.com