Error 425 when connecting to FTP server inside local network

I have a FTP serverinside my network with a fixed private ip address and a static public IP address. The server is set up in a DMZ and I am running BlackIce. I have opened ports 20 and 21 and for PASV I have ports 50000-500049 open. Connections to the server in active and passive mode from outside my network are just fine.

Connections from all but two PC's inside my network will connect in active and passive mode but when the LIST command is issued error 425 comes up. Some have recommened making sure the MTU size is the same for all the PC's and all are set to 1300.

I am using the filezilla server and the filezilla client.

Sygma6Asked:
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adamdrayerCommented:
how did you open up the ports?  What OS are you using?  do you have firewall software installed?  it sounds most definately like a communication problem on the listening port.  Go to the server and try and ping the client on that port.
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Sygma6Author Commented:
The Filezilla FTP server is in a DMZ set up by the router. All of the PC's are running Windows 2000. I opened the specific ports (20-21 and 50000-50049) in the BlackIce firewall software by allowing all connections on those ports to the server.  
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adamdrayerCommented:

OK.  First the router calls it's ports DMZ, because it doesn't do any port blocking with the internet.  Your private network, however, views this DMZ port as external and may be blocking ports between Internal network and DMZ.  you have to open up those ports on the router (50000-50049).  You also want to disable any software firewalls or antivirus programs temporarily.  

I'm pretty sure that's most likely it.  Your FTP server is demilitarized from the internet, but your router is still blocking ports between it and your internal network.
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Sygma6Author Commented:
I think I found out the problem. I had set the wan IP address in the passive port section if the server program and my router can not do loopbacks from wan IP's to internal IP's. I can now access the FTP server inside the network using a passive connection, but not an active one.
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adamdrayerCommented:
Great to hear you got it up and working!  You can request a points refund in the community support thread.
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Sygma6Author Commented:
Ok, excellent. I can't figure out how to close these topics either.
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moduloCommented:
PAQed with points refunded (110)

modulo
Community Support Moderator
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