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I get the error 421 error connection timed out.

I am already in passive mode, but still it's not able to execute certain FTP commands like LIST , NLST. What could be the cause?

I tried using both Filezilla and IIS-7.

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This is most likely a firewall issue as passive FTP clients connect to a random high port number for data transfers (including listings). This connection will need to be allowed into the server. – USD Matt Apr 5 '13 at 9:47
You try not using passive? – David Houde Apr 5 '13 at 11:43
I tried using passive mode...although the listing is working in a simple java application for the same ftp server , but i need to use it as a OSGI bundle , there is shows 421 connection timed out issue...if firewall be the cause it shldn't have been work either..?? – Raja Apr 6 '13 at 5:47

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