[Bug 209463] [net/3proxy]: ftppr became not functional in 0.8.x

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209463

            Bug ID: 209463
           Summary: [net/3proxy]: ftppr became not functional in 0.8.x
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: emz at norma.perm.ru
                CC: timp87 at gmail.com
                CC: timp87 at gmail.com
             Flags: maintainer-feedback?(timp87 at gmail.com)

I'm using 3proxy as FTP proxy (squid doesn't support DELETE command).
Config:

===Cut===
nserver 127.0.0.1
nscache 65536

timeouts 1 5 30 60 180 1800 15 60
daemon

log /var/log/3proxy/proxy.log D
logformat "- +_L%t.%.  %N.%p %E %U %C:%c %R:%r %O %I %h %T"

archiver gz /bin/gzip %F

rotate 10

external 0.0.0.0

internal 192.168.3.1

auth iponly
@allow * 127.0.0.1,192.168.3.22,192.168.3.41 * *

ftppr -p2121

setgid 22922
setuid 22924
===Cut===

After upgrading from 0.6.1 to 0.8.5 ftppr stopped to work:

===Cut===
[root at taiga:local/etc]# ftp 192.168.3.1 2121      
Connected to 192.168.3.1.
220 Ready
Name (192.168.3.1:emz): ftp at ftp.freebsd.org
331 ok
Password: 
230-
230-This is ftp0.ydx.FreeBSD.org, graciously hosted by Yandex.
230-
230-FreeBSD files can be found in the /pub/FreeBSD directory.
230-
230 Login successful.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> ls
229 Entering Extended Passive Mode (|||49904|)
ftp: Can't connect to `192.168.3.1:49904': Connection refused
200 OK
550 err
ftp> ^D
221 Goodbye.
===Cut===

As simple as that. If the target host is inside LAN, ftppr for some reason
allows to work with it, but during `ls` it cannot finish the output and
connection hangs (then gets terminated after some timeout). I've spend about an
hour trying to debug my configuration and networking problems - without any
result. Luckily, I had a machine with old 0.6.1 version, so I decided to
downgrade. After doiwngrading 0.8.5 to 0.6.1 ftppr suddenly restored it's
functionality, without changing the config.

Same session on 0.6.1, with exactly same config:

===Cut===
[root at taiga:3proxy/3proxy]# service 3proxy restart    
Stopping threeproxy.
Waiting for PIDS: 65700.
Starting threeproxy.
[root at taiga:3proxy/3proxy]# ftp 192.168.3.1 2121      
Connected to 192.168.3.1.
220 Ready
Name (192.168.3.1:emz): ftp at ftp.freebsd.org
331 ok
Password: 
230-
230-This is ftp0.ydx.FreeBSD.org, graciously hosted by Yandex.
230-
230-FreeBSD files can be found in the /pub/FreeBSD directory.
230-
230 Login successful.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> ls
229 Entering Extended Passive Mode (|||62859|)
ftp: Can't connect to `192.168.3.1:62859': Connection refused
200 OK
125 data
-rw-r--r--    1 ftp      ftp          5430 Jul 19  2014 favicon.ico
-rw-r--r--    1 ftp      ftp           660 Nov 02  2015 index.html
drwxr-xr-x    3 ftp      ftp             3 Jul 19  2014 pub
226 Directory send OK.
ftp> ^D
221 Goodbye.
===Cut===

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