[CentOS] Vsftpd configuration problem

Tue Apr 2 00:50:42 UTC 2013
Banyan He <banyan at rootong.com>

Hi Max,

It looks like a network issue instead of the software. Falling back to 
PORT sounds like to ACTIVE mode from PASV mode. In PASV, you will be 
connecting to a random port told by server with a random port from your 
side. Do you have a firewall to block such traffic that the system will 
send out port unreachable ICMP?

Maybe you can do a tcpdump to see what it is going on. For PASV, you can 
only use "host <client> and host <server> and tcp and not port 22" as 
the filter. It's not effective but it will collect what you want to 
locate the issue.

Best regards,

Banyan He
Blog: http://www.rootong.com
Email: banyan at rootong.com

On 4/2/2013 7:12 AM, Max Pyziur wrote:
> Greetings,
> Beginning today, I started to receive the following when ftp'ing to my
> CentOS 6 machine:
> ncftp /home/pyz2 > dir
> connect failed: No route to host.
> connect failed: No route to host.
> connect failed: No route to host.
> Falling back to PORT instead of PASV mode.
> I can make a connection, but I can't get a directory listing or transfer
> data/files.
> I'm flummoxed.
> What I had been doing is adding more directives to my /etc/hosts.deny
> file, today to include certain categories of ip addresses for the vsftpd
> service.
> I unwound that after I saw the problem starting to occur, and have
> restarted vsftpd several times.
> That hasn't changed the above issue.
> And yes, I've googled.
> My firewall setting has port 21 open.
> I can remotely telnet to hostname 21
> and I get a response indicating that the port is open.
> Any advice would be appreciated.
> Much thanks.
> Max Pyziur
> pyz at brama.com
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