[newbie] ftp proxy question

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my isp here in the uk only allows ftp via its proxy on the particular
account i use (claranet freetime unlimited).

i just tried to use 'update' but it hung on 'please wait while fetching
the list of upgrade packages' i think this is because of the proxy
issue, is there a way to tell this feature about my isp proxy?

i am using mandrake 7

bascule