FtpWebRequest doesn't work in parallel threads

[Elina Lazebnik]

I work with C# 2.0 VC2008.
I use a number of Background Workers for open multiply FTP Connections to same FTP Server. The connections are in an Active FTP Mode.
When I start 2 connections together, the first one is working properly and the second stops after the connection has been established good and waits for Data ( get data only after the first connection closed ).
When I run two applications with one FTP Session for each, I haven't any problem.


This is a part of request code :

// sPath =  "ftp://user_name:user_pass@server_address:21//path")
                FtpWebRequest request = (FtpWebRequest)WebRequest.Create( sPath );  
                request.UsePassive = false;
                request.Proxy = null;
                request.Method = WebRequestMethods.Ftp.GetFileSize;

                this.curFTPState.FileName = Path.Combine(sPathTo, filename);
                this.curFTPState.FTPMethod = WebRequestMethods.Ftp.GetFileSize;
                this.curFTPState.Request = request;


                // Start the asynchronous request.   
                IAsyncResult result = (IAsyncResult)request.BeginGetResponse(new AsyncCallback(RespCallback), curFTPState);

[Mutant_Fruit]

Does the FTP server in question allow multiple connections from the same IP?

[Elina Lazebnik]

Yes, actually same application, has run twice with one connection each, is connecting and getting data perfect. On specific server I can open only 2 connections simultaneously, because system limitation.