I try to use NuGet (1.5) in VS2010, but whenever I try to "manage NuGet packages", or use the package manager console to install the package (using the default source package), I get a dialog with a hint for credentials.
I am behind the company proxy, but my proxy credentials do not work. Canceling the dialog leads to the error "(401)" Unauthorized ".
I also use TFS 2010, but I do not know if this is part of the problem. I tried the solution here: Installing a package with NuGet connects to TFS and gives error 401 , but I can't even get to the point where I can list the packages.
I tried a different package source as suggested here: NuGet Package Manager Error: The remote name could not be resolved without change.
I tried all the solutions here: Unable to connect to any Internet resource to no avail, and this problem is TF30063: You do not have access to the Collection. Nuget and Tfs conflicting were similar, but not the same.
Any suggestions?
(edit) Additional information:
When I start Fiddler2, this is what I get when I add credentials. FW-1 is the name of the company proxy / firewall, so I am sure that the problem is due to the lack of credentials.
HTTP/1.0 401 Unauthorized WWW-Authenticate: Basic realm="FW-1. Reason: no user Server " Content-Type: text/html Content-Length: 166 <TITLE>Error</TITLE> <BODY> <H1>Error 401</H1> FW-1 at firewall2: Unauthorized to access the document.<BR><BR><LI>Authorization is needed for FW-1.<BR><BR> </BODY>
(edit 2): Here is an image of what Fiddler2 shows me when I try to login again. I am not familiar with the tool to find out what I can do to get more information. 
Adrian
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