550 file unavailable error with FtpWebRequest class file upload. Works fine in FileZilla

Question

I\'m searched and found other questions on this but none have solved my issues. I\'m trying to upload a file via FTP using sample MSDN code. I get the The remote server retu

Answer 1

This answer is for Steen and contains a PowerShell equivalent to the code in http://support.microsoft.com/kb/2134299 below. I don't have a system that has the non-compliant behavior to test against so you'll need to try it yourself.

function SetMethodRequiresCWD() {
    [Type] $requestType = [System.Net.FtpWebRequest]
    [System.Reflection.FieldInfo] $methodInfoField = $requestType.GetField("m_MethodInfo", [System.Reflection.BindingFlags]::NonPublic -bor [System.Reflection.BindingFlags]::Instance)
    [Type] $methodInfoType = $methodInfoField.FieldType


    [System.Reflection.FieldInfo] $knownMethodsField = $methodInfoType.GetField("KnownMethodInfo", [System.Reflection.BindingFlags]::Static -bor [System.Reflection.BindingFlags]::NonPublic)
    [Array] $knownMethodsArray = [Array]$knownMethodsField.GetValue($null);

    [System.Reflection.FieldInfo] $flagsField = $methodInfoType.GetField("Flags", [System.Reflection.BindingFlags]::NonPublic -bor [System.Reflection.BindingFlags]::Instance)

    [int] $MustChangeWorkingDirectoryToPath = 0x100
    ForEach ($knownMethod In $knownMethodsArray) {
        [int] $flags = [int]$flagsField.GetValue($knownMethod)
        $flags = $flags -bor $MustChangeWorkingDirectoryToPath
        $flagsField.SetValue($knownMethod, $flags)
    }
}