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When used with Java 7, some people are seeing an IOException saying "Connection reset" after the PASV or PORT commands are sent.

This is the Windows firewall blocking Java 7 when it sees these commands sent on a socket. Normally, the Windows firewall prompts to add a newly installed program. But in this case it doesn't seem to happen - we aren't sure why.

User, yetikov, on the Netbeans forum reports that the following command will fix the problem:
netsh advfirewall set global StatefulFTP disable

We have also had a report that ZoneAlarm can cause this problem - again, it did not prompt to stop blocking.

A bug report has been submitted to Sun/Oracle - http://bugs.sun.com/bugdatabase/view_bu ... id=7077696

You can help bring attention to the problem by voting it up here.
closed with the note: Answered

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Best answer
Microsoft has publicly released a hotfix. They imply that the fix will be included in a general software update in the future:
if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

- Hans (EnterpriseDT)