using windows authentication on .NET client and Java server
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How can I get an authentication token(or something like that) from my Windows Domain in .NET client, which I can send to a java server, who is responsible to authenticate the user.

I have a client application and to log on to the server I want to use windows login information(I want that the user don't have to retype his/her password)

I think I have to use something like NetworkCredential, but the constructor requires the password and I haven't find a way to get current users NetworkCredential

Thanks