chrome "This webpage is not available." while firefox & ie11 ok

WebPageTest Private Instances
1

Hi, i got a problem:
firefox & ie 11 works ok at client, while chrome does not; When i test a website(name it with xxx.com), chrome opens http://127.0.0.1:8888/blank2.html and then navigate to xxx.com, which results in “This webpage is not available.” After a while it closes.

My system: windows 8.
My webpagetest version: 2.13
My chrome version: Version 35.0.1870.2 dev-m

wptdriver.ini:

[WebPagetest]
url=http://127.0.0.1/
location=Local-WPTDriver
browser=chrome
;key=TestKey123
;Automatically install and update support software (Flash, Silverlight, etc)
;software=http://127.0.0.1/installers/software.dat

[chrome]
exe="C:\Program Files\Google\Chrome\Application\chrome.exe"
options='--load-extension="%WPTDIR%\extension" --user-data-dir="%PROFILE%" --no-proxy-server'
;installer=http://127.0.0.1/installers/browsers/chrome.dat

[Firefox]
exe="D:\Program Files\Mozilla Firefox\firefox.exe"
options='-profile "%PROFILE%" -no-remote'
;installer=http://127.0.0.1/installers/browsers/firefox.dat
template=firefox

locations.ini

[locations]
1=Local
default=Local

;
; These are the top-level locations that are listed in the location dropdown
; Each one points to one or more browser configurations
;

[Local]
1=Local-URLBlast
2=Local-WPTDriver
label=Local


;
; Tese are the browser-specific configurations that match the configurations
; defined in the top-level locations.  Each one of these MUST match the location
; name configured on the test agent (urlblast.ini or wptdriver.ini)
;

[Local-URLBlast]
browser=IE 11
latency=0
label="Local - IE 11"
browserExe=pagetest.exe
key=TestKey123

;
; For a wptdriver configuration (chrome, firefox), the browser labels here 
; MUST match the labels used in wptdriver.ini
;

[Local-WPTDriver]
browser=Chrome,Firefox
label="Local"

;
; This is an exaple of a "remote" configuration where tests can be proxied to a remote
; webpagetest instance.  The test will be run by the remote server but the results
; will be downloaded to the local server and deleted from the remote agent
;
; Each location that you want to use from the remote server needs to be configured
; individually on the local configuration (location names do not need to match)
;
; To use the public webpagetest.org instance you will need an API key
;

Plz help. Thx!