private int GetPortV6(string responseString)
{
int pos1 = responseString.LastIndexOf("(");
int pos2 = responseString.LastIndexOf(")");
if (pos1 == -1 || pos2 <= pos1)
throw new FormatException(SR.Format(SR.net_ftp_response_invalid_format, responseString));
// addressInfo will contain a string of format "|||<tcp-port>|"
string addressInfo = responseString.Substring(pos1 + 1, pos2 - pos1 - 1);
string[] parsedList = addressInfo.Split(new char[] { '|' });
if (parsedList.Length < 4)
throw new FormatException(SR.Format(SR.net_ftp_response_invalid_format, responseString));
return Convert.ToInt32(parsedList[3], NumberFormatInfo.InvariantInfo);
}