Rebalancing for two nodes passes with errors

I installed win2008_x86_1.6.0beta3b-42 on Windows Server 2008 64.
After that installed it on Windows Server 2008 32 and joined server during setup.
Go to Manage Servers, click Rebalance. You will be redirected to Cluster Overview page with error displayed. Go to Manage Servers, repeat rebalancing if it is stopped. It is passed.

Rebalance completed successfully. ns_orchestrator001 18:34:09 - Mon Aug 23, 2010
Starting rebalance, KeepNodes = ['ns_1@192.168.1.109','ns_1@192.168.1.195'], EjectNodes = [] ns_orchestrator004 18:33:42 - Mon Aug 23, 2010
Client-side error-report for user "Administrator" on node 'ns_1@192.168.1.109': User-Agent:Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.1) Gecko/20090715 Firefox/3.5.1 Browser client XHR failure encountered. (age: 1038) Diagnostic info: s: {}, statusCode: undefined, responseText: menelaus_web102 18:33:15 - Mon Aug 23, 2010
Server error during processing: ["web request failed",

{path,"/controller/rebalance"}

,

{type,exit}

, {what, {timeout, {gen_fsm,sync_send_event, [

{global,ns_orchestrator}

,

{start_rebalance, ['ns_1@192.168.1.109', 'ns_1@192.168.1.195'], []}

]}}}, {trace, [

{gen_fsm,sync_send_event,2}

,

{menelaus_web,handle_rebalance,1}

,

{menelaus_web,loop,3}

,

{mochiweb_http,headers,5}

,

{proc_lib,init_p_do_apply,3}

]}] menelaus_web019 18:33:14 - Mon Aug 23, 2010
Rebalance exited with reason {timeout, {gen_server,call, [

{'ns_memcached-default','ns_1@192.168.1.109'}

,

{get_vbucket,157}

]}} ns_orchestrator002 18:33:09 - Mon Aug 23, 2010
Starting rebalance, KeepNodes = ['ns_1@192.168.1.195','ns_1@192.168.1.109'], EjectNodes = [] ns_orchestrator004 18:32:55 - Mon Aug 23, 2010
Client-side error-report for user "Administrator" on node 'ns_1@192.168.1.109': User-Agent:Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.1) Gecko/20090715 Firefox/3.5.1 Browser client XHR failure encountered. (age: 4106) Diagnostic info: s: {"url":"/pools/default/rebalanceProgress","global":true,"type":"GET","contentType":"application/x-www-form-urlencoded","processData":true,"async":true,"accepts":

{"xml":"application/xml, text/xml","html":"text/html","script":"text/javascript, application/javascript","json":"application/json, text/javascript","text":"text/plain","_default":"*/*"}

,"timeout":5000,"dataType":"json"}, statusCode: undefined, responseText: menelaus_web102 18:32:53 - Mon Aug 23, 2010
Node ns_1@192.168.1.109 joined cluster