How to properly disconnect from FTP server with FtpWebRequest

I've created a ftp client that connects several times during the day to retrieve log files from a FTP server. The Problem is that after a few hours I am getting an error message from the FTP server (-421 session limit reached..). When I check the connections with netstat, I can see several 'ESTABLISHED' connections to the server even though I've "closed" the connection. When I try to do the same over the command line or FileZilla, the connections are properly closed. ``` ftpRequest = (FtpWebRequest)FtpWebRequest.Create(host + "/" + remoteFile); ftpRequest.Credentials = new NetworkCredential(user, pass); ftpRequest.UseBinary = true; ftpRequest.UsePassive = true; ftpRequest.KeepAlive = true; ftpRequest.Method = WebRequestMethods.Ftp.DownloadFile; ftpResponse = (FtpWebResponse)ftpRequest.GetResponse(); ftpStream = ftpResponse.GetResponseStream(); FileStream localFileStream = new FileStream(localFile, FileMode.Create); int bytesRead = ftpStream.Read(byteBuffer, 0, bufferSize); /* Resource Cleanup */ localFileStream.Close(); ftpStream.Close(); ftpResponse.Close(); ftpRequest = null; ``` How can I close/disconnect the connection properly? Did I forget anything?