This article was previously published under Q190675
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When using the Copy Web feature in Visual InterDev, the following errorappears:
The Web application '<your Web name>' was not copied successfully. NTLM authentication failed because you are connecting to the server via a proxy server and NTLM authentication does not work in this case. You should either disable NTLM authentication for the server or, if the proxy server is unnecessary, add the server to the List of Hosts without proxies in the Tools/Options dialog."
This error appears erroneously if you specify a destination Web server inthe Copy Web window using an IP address instead of a computer name in theCopy Web dialog window.
There are two methods to work around this error message:
Specify the destination Web server using a computer name.
Disable the proxy settings in the Options dialog box.
Use the following steps to the second method:
Select Options from the Tools menu.
Select Projects|Web Proxy Settings in the list on the left of the Options window
Clear the "Use system settings" setting.
Make sure the HTTP proxy field is empty.
Copy your Web application using the Copy Web feature.
Microsoft has confirmed this to be a bug in the Microsoft products listedat the beginning of this article. We are researching this bug and will postnew information here in the Microsoft Knowledge Base as it becomesavailable.
Steps to Reproduce Behavior
From the Project menu, select Web Project and Copy Web Application.
In the destination Web server field, enter the IP address for the Web server.
Set any additional options that apply in the Copy Web dialog bix and click OK.