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copied!<p>Here is the code for the <strong>final solution</strong>.</p> <hr> <pre><code>$artifacts = "http://teamcity/repository/download/bt1/.lastSuccessful/%7Bbuild.number%7D.zip" $login = "http://teamcity/ntlmLogin.html" $dest = "Artifacts.zip" $TeamCitySession = New-Object Microsoft.PowerShell.Commands.WebRequestSession Invoke-WebRequest -Uri $login -WebSession $TeamCitySession -UseDefaultCredentials -UseBasicParsing Invoke-WebRequest -Uri $artifacts -WebSession $TeamCitySession -UseBasicParsing -OutFile $dest </code></pre> <hr> <p>In order to figure out what was happening I needed to use Fiddler to trace what a successful request looks like and also trace what was happening in PowerShell. In order to do that I had to make my PowerShell request use it. The following is how I turned on Fiddler tracing from within PowerShell.</p> <pre><code>Invoke-WebRequest -Uri $artifacts -UseDefaultCredentials -Proxy http://localhost:8888/ </code></pre> <p>By adding the <em>-Proxy</em> argument to the command it told he command to use Fiddler as a proxy server.</p> <p>From here I saw that TeamCity was redirecting me to the login page. Since I have NTLM authentication turned on there is a special page that you browse to in order to login. So what I wanted to do from here was to visit this login page and then download the file using the cookies that I get back as TeamCity uses a cookie to track authentication status.</p> <p>It also turns out that the <em>Invoke-WebRequest</em> cmdlets also allow you to connect them using a web session. There are two ways of accomplishing this using either the <em>-WebSession</em> or the <em>-SessionVariable</em> parameter. After some trial and error it turns out that if you use the <em>-SessionVariable</em> parameter it will overwrite the session variable after each request, so that it doesn't actually share the state. Clearly this is not the behavior I am looking for. Instead I had to use the <em>-WebSession</em> parameter and then I could chain together the login and the download of the file. Once I did this then everything started working.</p>

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