Nefunguje pristup na ProFTPd server z Internetu

[vbvyvojar na volny.cz]

Zdravím,
potreboval bych poradit kde hledat pricinu, mam instalovany DebianSarge s
ProFTPd version 1.210. Od internetu je oddeleny Firewalem na kterem jsou
povolene porty 20, 21, 60000 až 65535. Pristup z vnitrni LAN na ProFTPd
server funguje presne podle konfigurace, ale pri pokus o pristup z
Internetu se pouze otevre FTP session a dale uz neprobehne overeni a po
timeoutu dojde k odpojeni, viz. nize vypis ze Syslogu. Pouzivam pasivni
rezim. Pro uplnost prikladam take vypis "proftpd.conf". 

ServerName "linuxserver" 
ServerType standalone 
DeferWelcome off 
MultilineRFC2228 on 
DefaultServer on 
ShowSymlinks on 
TimeoutNoTransfer 600 
TimeoutStalled 600 
TimeoutIdle 1200 
UseReverseDNS off 
IdentLookups off 
DisplayLogin welcome.msg 
DisplayFirstChdir .message 
ListOptions "-l" 
DenyFilter \*.*/ 
Port 21 
MaxInstances 30 
User nobody 
Group nogroup 
Umask 022 022 
AllowOverwrite on 
<VirtualHost 192.168.1.70> 
<Anonymous /var/www> 
User petr
Group vyvoj 
<Directory /var/www> 
<Limit IgnoreHidden> 
AllowAll 
</Limit> 
</Directory> 

</Anonymous> 
MasqueradeAddress X.X.X.X # X.X.X.X is Internet firewall's IP address 
PassivePorts 60000 65535 
Port 21 
</VirtualHost> 

<Global> 
PassivePorts 60000 65535 
</Global> 
TimeoutLogin 600 

-----------------------------------------------------------------------------------

List from syslog when attepting to access from Internet 


Mar 29 05:27:55 linuxserver proftpd[1757]: linuxserver - 192.168.1.70:21
masquerading as X.X.X.X 
Mar 29 05:28:11 linuxserver proftpd[2858]: linuxserver (Y.Y.Y.Y[Y.Y.Y.Y])
- FTP session opened. 
Mar 29 05:28:18 linuxserver proftpd[2858]: linuxserver (Y.Y.Y.Y[Y.Y.Y.Y])
- FTP session closed.