FTP Hung out to dry.

[DarwinIT]

I just wrote an application which employes FTP to read and copy files. It worked fine on our test FTP server - which is on our network. We got a new server just for this task and my application which worked flawlessly now hangs up when making a call to read the directory. The statement that causes the hang is

client = listner.AcceptTcpClient();
listner is a TcpListener and client is a TcpClient

I suspect this has something to do with the firewall or with the setup of FTP (interactive FTP works just fine - it just doesn't work from the c# code.) Anyone have a clue here???

 

[DarwinIT]

One new piece of information. Before the call is made to AcceptTcpClient - a 425 error is encountered. The code I have only looks at the first response which is an acceptable 150. So it does not have a data connection at the time it is issuing this command. So the real issue seems to be the 425 error.

 

[PRPhx]

Take a look here:

http://www.tek-tips.com/viewthread.cfm?qid=1531407&page=21

Also do a google search for c# error 425. You might also look at your event logs for more help on what's going on.

Sounds like, from google emtries, there may be a problem with your firewall?

 

[DarwinIT]

I have resolved the problem by switching from Active mode to passive mode. Ironically some of the people in threads that I found fixed the problem by doing the reverse. Go figure!! Anyway it works now. Thanks!!!