I am using a Netopia 3347 DSL Switch to connect to the internet. Behind that I have a Linsys VPN Firewall router.
Internet - Netopia - DMZ - Linksys - LAN
I have an exchange server and FTP server in the DMZ
Currently my workstations on the LAN can access most all web objects just fine. However, they can not access FTP. Not the FTP server in the DMZ or any on the web.
Let's start with clients inability to access any ftp site first.
Netopia DSL Switch
Netopia ipmaps .105 to .198 and .108 to .111
Exchange server 192.168.10.198 and 192.168.101.4 (dual nics)
FTP Server 192.168.10.111
LAN - 192.168.101.
LAN workstations can see second NIC on exchange server. Email sends & recieves just fine.
Lan workstations (typ. Win 7 64) can not connect to FTP sites.
My particular workstation has ports 20,21,990 open in firewall (TCP) and I can not connect to ftp://ftpmdot.state.mi.us/
(as an example) with either firefox or blaze ftp.