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how block port 21


maisun
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Start Menu -> Local Area Connection > properties

item -> Properties button >Tcp/IP > properties > Advanced -> options,

Tcp IP Filtering is in the list, highlite/select it

Beneath the Optional Settings, press/click the properties button on the lower right-hand side

Check the "Enable Tcp/IP Filtering"

There you choose which ports you want to block

this is for XP

vista and 7 should be similar

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