Thank you, maybe I found cause of this problem. In normal conditions, CFileException will be thrown. But in some special conditions, as multi-thread, communication with devices as USB I/O … then other exception has thrown before that. ----------------- Best Regards, Le Thanh Cong

thanks ----------------- conglt

DavidCrow wrote: wanting the firewall's IP address instead. you mean the proxy?:^) --[V]--

Bounds checker is good but expensive, I can't buy it ----------------- conglt -- modified at 3:28 Tuesday 18th April, 2006

Well, the reason for that is when you run a windows application, it's run in the current windows user's identity. There's no need for a sign-on. Logifusion[^]

Thank you very much ----------------- conglt

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