Openfire / JSJaC error 503 with Firefox and Chrome

I setup my JSJac by this article

Then I can connect Openfire with JSJaC via Internet Explorer but for Firefox and Chrome I always get this error message

An error occured:

Code: 503

Type: cancel

Condition: service-unavailable

My parameters are:

Backend Type - HTTP Binding

HTTP Base - http://{server-ip}:7070/http-bind/

Jabber Server - http://{server-ip}

Username - …

Password - …

Please advice me. I stuck on this for a week.

I have tried to tracking post data. When I use Internet Explorer I have post data but when I use Firefox or Chrome the post data is nothing.