System.IO.IOException: Logon failure when stringwriting a file.

[qwert231]

I am trying a stringWrite function to append a text file on another server. Here is the code:

Dim sw As IO.StreamWriter = IO.File.AppendText("\\serverName\weborders\tmp ord-h.txt")

But I get the error: System.IO.IOException: Logon failure: unknown user name or bad password.

This server is inside my firewall, while the webserver is in the DMZ. But I haven't tried there yet. I am currently trying from my test system which is also inside the firewall.

Any help please?!