Sounds strange. I have a Netgear FR314, and I do not need to forward any port for passive nor port mode. Nobody is initiating a connection to you, such as an FTP server would; you are initiating a connection out, so I wouldn't think that would be a problem.
If I am wrong or misinformed, I'd like to know; always in the need for knowledge.
AndyD, did this resolve the issue? This happens to some sites and not others? Maybe the sites who you are trying to connect to (w/ pasv) are not properly configured. I know once you have a router on both the server and client side, connecting (via pasv is must) is troublesome because servers aren't correctly configured.
Hope it worked out for you anyway
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