Do you have a proxy page set up? What do you see when you watch your http requests via something like firebug or fiddler? Are your edit requests successful?
Yes the proxy page is set already. But can you talk more how can I find out with Firebug. I have Firebug in my firefox but I don't know how to test the proxy with Firebug.
And what about the warning I got in ArcMAP, is it related to my problem I have?