How can I decrypt an encrypted MCRYPT_RIJNDAEL_256 value in C#, that was encrypted by mcrypt in PHP?

I am trying to read a Base64-Encoded value from a Database table managed on the Linux side. In that table there is a column called first_name. On the Linux side I can decrypt this easily by using the following command in PHP:

$data = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, "patient_fn_salt",
                       base64_decode("H6XmkH+VWvdD88THCliKJjLisGZIBk3CTNvyQMLnhpo="),
                       MCRYPT_MODE_ECB);

However I try as much as I can to duplicate this logic on the C# side and all I get is gibberish.

My C# code is below, i hope you have some suggestions because I ran out of ideas :(

byte [] cipherText =
         Convert.FromBase64String("H6XmkH+VWvdD88THCliKJjLisGZIBk3CTNvyQMLnhpo=");
byte [] key = Encoding.UTF8.GetBytes("patient_fn_salt");
Array.Resize(ref key, 32);
byte [] iv = new byte[32];

string fname = Utilities.Decrypt(cipherText, key, iv);


public static string Decrypt(byte[] cipherText, byte[] Key, byte[] IV)
  {
   // Check arguments.
   if (cipherText == null || cipherText.Length <= 0)
    throw new ArgumentNullException("cipherText");
   if (Key == null || Key.Length <= 0)
    throw new ArgumentNullException("Key");
   if (IV == null || IV.Length <= 0)
    throw new ArgumentNullException("Key");

   // TDeclare the streams used
   // to decrypt to an in memory
   // array of bytes.
   MemoryStream msDecrypt = null;
   CryptoStream csDecrypt = null;
   StreamReader srDecrypt = null;

   // Declare the AesManaged object
   // used to decrypt the data.
   RijndaelManaged rj = new RijndaelManaged();

   // Declare the string used to hold
   // the decrypted text.
   string plaintext = null;

   try
   {
    // Create an AesManaged object
    // with the specified key and IV.

    rj.Mode = CipherMode.ECB;
    rj.BlockSize = 256;
    rj.KeySize = 256;
    rj.Padding = PaddingMode.Zeros;

    rj.Key = Key;
    rj.GenerateIV();
    //rj.IV = IV;


    // Create a decrytor to perfor