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AuthorForum: PowerTCP FTP for .NET
Topic: An existing connection was forcibly closed by the remote host
darrychui
dchui@blueskymg.com

From: San Ramon, CA USA
Posts: 2
Member Since: 09/08/08
posted September 8, 2008 1:55 PM

I am using your PowerTCP FTP for .Net for several years without any issues.
However, we recently trying to setup a new client connection in our production enviornment and I am getting the error message "An existing connection was forcibly closed by the remote host" when I issue the ftp.List("",True) statement. This error only happens on our production server because I can use the same code on my development box with no issues.  Also, I was able to use the command line microsoft ftp to connect to this client again without any issues. Please give me some idea as to why this is happening.

Thanks
Mike Baldwin (Admin)



From: Rome, NY USA
Posts: 114
Member Since: 04/11/00

Extra Support Options
Custom Application Development

posted September 8, 2008 3:35 PM

Sure.

When Windows Firewall is enabled it provides a transparent FTP proxy on the client. Unfortunately, when it closes the data connection it does a "hard close", resulting in the exception message you are experiencing. We've not seen any additional side-effects except for the message you're seeing.

Can you confirm that this is the difference between your 2 clients?
darrychui
dchui@blueskymg.com

From: San Ramon, CA USA
Posts: 2
Member Since: 09/08/08
posted September 8, 2008 4:50 PM

No. I don't think it is the firewall because I can use the command line microsoft ftp on that server and connect to that client and issue a dir or ls command. Anything else I can try?
Mike Baldwin (Admin)



From: Rome, NY USA
Posts: 114
Member Since: 04/11/00

Extra Support Options
Custom Application Development

posted September 8, 2008 5:34 PM

A better test would be to turn the Firewall off and see what happens.

The command line microsoft ftp does not report a hard close.
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