Use windows authentication in client/server application

[Le Thanh Cong]

I write a application client/server (windows form). Both client & server run in a Active Directory domain. When client connect to server, server will get IP of client. Base on IP, server check current user logon in client PC, determines if the user has been authenticated by Windows. At client, I can use System.Security.Principal.WindowsIdentity.GetCurrent() to authenticate user but at server, I don't know way authenticate remote user. In case, what is solution? System.DirectoryService? conglt

[Dave Kreskowiak]

Ummm, there's no need to check to see if Windows authenticated the person or not. If the authentication failed, that person would not be logged onto Windows, and therefore, there won't be a user logged on. All you really need to do is on the client side, pass the clients WindowsIdentity (use GetCurrent), to the server. The server will then have everything it needs to know about the user. Dave Kreskowiak Microsoft MVP - Visual Basic