port forwarding doesn't work [closed]

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http://serverfault.com – I have a problem with port forwarding on a wimax modem : HUAWEI BM632w I configured all, but it doesn't work. when I send a request on port 80 of modem, that is forwarding on our Linux server, It raise a timeout error and doesn't work.. I don't know what is problem? I should mention that we have an IP static on our wimax modem. (HowTos)