Odd trouble!

[daywalker]

I have an odd trouble with FTP. If I approach my (ISPConfig)Server from outside, that means from the WAN, it runs normaly (I anticipate this is natural velocity at least. Even though it could be often faster. ). But if I approach it via LAN it's every really sluggish. It must be some web/firewall matter. Has anyone any hint? BTW: my ISPConfig-Server is in the DMZ and thus my LAN customer is in a distinct subnet. But there should be no restrictions vom the LAN->DMZ from the firewall. I have disabled the ISPConfig firewall overly. So I wear't recognize where's the trouble really. Any assistance would be greatly appreciated, thanks in advance.