This post points to the various examples and blog posts scattered among the chilkatsoft.com, example-code.com, and cknotes.com involving progress monitoring of FTP uploads and downloads using the Chilkat FTP2 ActiveX, .NET component, and C++ libs. Important for Monitoring Upload Progress: The SendBufferSize property is set to a large value (512K) to maximize performance. Unfortunately, this usually ruins the frequency of […]
Problem: An FTP transfer fails with the following message found in LastErrorText: 426 Connection closed; transfer aborted Solution: A local firewall may be blocking the connection. Try switching between Active and Passive mode and try again. See these examples: ASP: Active and Passive Modes in FTP SQL Server: Active and Passive Modes in FTP C#: Active and Passive Modes in […]
The following Chilkat FTP2 error was found by a Chilkat customer to be caused by firewall restrictions. I do not know the specifics of the firewall restrictions that caused the error, but the LastErrorText (with all customer information removed) is reproduced here to help identify this problem in the future. The important point is to see that the SSL/TLS handshake […]
Question: A quickie question about the FTP2 control. I have some clients with strange FTP servers that return the directory listings in formats that no control seems to be able to handle (although I have not tried yours!). However, it is next to impossible to test, since I do not have access to their server. For them, we use the […]
The Chilkat VC++ static libraries are for unmanaged C++ applications. A Managed C++ application (using Microsoft’s Managed Extensions for C++) runs within the .NET Framework and therefore must use the Chilkat .NET assembly. The Chilkat C++ online reference documentation and online examples are for unmanaged C++ applications. For Managed C++, the best choice is to read the C# online documentation […]
I get the following support problem about once per week from ASP developers: The ASP developer wants to upload a file from the client computer where the browser is running, to an FTP server. He writes ASP code to do the FTP upload, but cannot understand why the file is not found. The thing the ASP developer doesn’t realize is […]
There are many FTP2 component properties that affect how data connections are established between the FTP client (Chilkat FTP2) and the FTP server. Finding a workable combination of property settings for a given client/server situation can be difficult. This blog post can hopefully provide some guidance. Before beginning, it is crucial to understand one basic thing about the FTP protocol: […]
Question: I’ve downloaded the trial version of your FTP2 ActiveX control. I’m using it in Visual FoxPro 9, but need to have a progress bar to track an upload. When using your asynchronous example code, the progress bar jumps from 0 to 524288 and so on. I need much more precision than that so the progress bar will update smoothly. […]
This page explains Active and Passive mode in the FTP protocol. FTP Active vs. Passive Mode
Question: What is this error message? How can I avoid such error message in the future? ChilkatLog: ChangeRemoteDir: DllDate: Sep 1 2009 UnlockPrefix: ABC123FTP Username: something Component: .NET 2.0 dir: / SocketError: WSAECONNRESET An existing connection was forcibly closed by the remote host. Error sending on socket send_size: 7 Failed to send CWD command Failed. Answer: This indicates that the […]