vsftpd hanging after receiving password, pure-ftpd works

[B Wooster]

I am stumped trying to debug this problem - it looks like a vsftpd config 
issue, does not look like a firewall issue - since I tried another FTP 
server (Pure-FTPD), and it works fine.

Whenever I try to FTP from outside my firewall, I get the "Connected" 
message, then I enter the User, and then Password:
After entering password, the is no activity for five minutes, and then I get 
a "421 Timeout.
Login failed.
No control connection for command: Permission denied"
at the client.

Looking at vsftpd.log on my server, I see:
Thu May 26 07:15:41 2005CONNECT: Client "nnn.nnn.nnn.11"
Thu May 26 11:15:41 2005FTP response: Client "....11", "220 (vsFTPd 2.0.1)"
Thu May 26 11:15:43 2005FTP command: Client "....11", "USER hhh
Thu May 26 11:15:43 2005FTP response: Client "....11", "331 Please specify 
the password."
Thu May 26 11:15:45 2005FTP command: Client "....11", "PASS <password>"
Thu May 26 11:20:43 2005FTP response: Client "....11", "421 Timeout."

I looked at my firewall logs on my server, and it shows no suppression or 
blocking of access at that time. 

Is there any more debugging I can turn on, or anything else to try at vsftpd 
server end?

I can use FTP inside the firewall, which seems to suggest a problem with the 
firewall, but as I mentioned, none of the FTP server firewall logs show 
anything, and using other servers such as Pure-FTPD makes everything work 
just fine.

Is there any additional logging I can turn on in vsftpd, or if anyone has 
any other suggestions to try, let me know.

I'm using Fedora FC3: 2.6.11-1.14_FC3, vsFTPd 2.0.1
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