Cannot enable auto-failover / delete bucket

Hi,

We have a 8 node cluster. And for some strange none of the admin commands are working. I cannot enable fail over, I cannot delete a bucket. Can't even remove server and rebalance. The shows the following errors:

On trying to enable fail over:

Server error during processing: ["web request failed",
{path,"/settings/autoFailover"},
{type,exit},
{what,
{noproc,
{gen_server,call,
[{global,auto_failover},
{enable_auto_failover,30,1}]}}},
{trace,
[{gen_server,call,2},
{menelaus_web,
handle_settings_auto_failover_post,1},
{menelaus_web,loop,3},
{mochiweb_http,headers,5},
{proc_lib,init_p_do_apply,3}]}]

On trying to delete bucket:

Server error during processing: ["web request failed",
{path,"/pools/default/buckets/sitep13n"},
{type,exit},
{what,
{noproc,
{gen_fsm,sync_send_event,
[{global,ns_orchestrator},
{delete_bucket,"sitep13n"},
infinity]}}},
{trace,
[{gen_fsm,sync_send_event,3},
{menelaus_web_buckets,
handle_bucket_delete,3},
{menelaus_web,loop,3},
{mochiweb_http,headers,5},
{proc_lib,init_p_do_apply,3}]}]

on trying to remove server and rebalance:

Server error during processing: ["web request failed",
{path,"/controller/rebalance"},
{type,exit},
{what,
{noproc,
{gen_fsm,sync_send_event,
[{global,ns_orchestrator},
{start_rebalance,
['ns_1@10.63.49.44','ns_1@10.63.49.250',
'ns_1@10.63.49.254',
'ns_1@10.63.52.163',
'ns_1@10.63.52.248',
'ns_1@10.63.53.244',
'ns_1@10.63.55.243'],
['ns_1@10.63.55.240'],
[]}]}}},
{trace,
[{gen_fsm,sync_send_event,2},
{menelaus_web,do_handle_rebalance,3},
{menelaus_web,loop,3},
{mochiweb_http,headers,5},
{proc_lib,init_p_do_apply,3}]}]

Any ideas what I can do? Do I have to bring down the entire cluster, delete the data directory manually and bring up the entire cluster again???

regards,
-Piyush