WebRequest fails on TeamCity with HTTP-400 error

I have a powershell script that makes a SOAP call to an API:

[System.Net.ServicePointManager]::ServerCertificateValidationCallback = {$true}

$request = [System.Net.WebRequest]::Create("https://***.***.***.***/iControl/iControlPortal.cgi")
$request.Method = "POST"
$request.Credentials = new-object System.Net.NetworkCredential @("username", "password")
$request.Proxy = new-object System.Net.WebProxy @("***.***.***.***", ****)
$request.PreAuthenticate = $true;
$request.CachePolicy = new-object System.Net.Cache.RequestCachePolicy "NoCacheNoStore"

$payload = '<?xml version="1.0"?><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"><soap:Body><q1:get_monitor_status xmlns:q1="urn:iControl:LocalLB/PoolMember"><pool_names href="#id1" /></q1:get_monitor_status><soapenc:Array id="id1"><Item>{0}</Item></soapenc:Array></soap:Body></soap:Envelope>' -f "my-pool"
$requestPayloadWriter = new-object System.IO.StreamWriter $request.GetRequestStream()

$responsePayloadReader = new-object System.IO.StreamReader $request.GetResponse().GetResponseStream()
$pool_status = $responsePayloadReader.ReadToEnd()


This works locally on my machine, but fails when I run it via TeamCity.It does work when I remote into the agent and run script manually from the console.

The message I get from PowerShell is:

Exception calling "GetResponse" with "0" argument(s): "The remote server returned an error: (400) Bad Request."

Any suggestions on what could be going wrong or how to diagnose this further? I was not able to capture any traffic using Fiddler, so any suggestions on that are also welcome.


The problem was, it turns out, the F5 API I was calling. There is a bug in the version of F5 we are using: under certain conditions requests get rejected with a 400-response.

Nothing to do with TeamCity/Powershell.

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