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    BSNL FTTH - Open ports issue

    BSNL has modified the firmware on the FTTH modem and when I run a Shields Up test it shows that ports 23, 53, and 80 are open. There could be others too. How can I "stealth" all of these when there are no option on the FTTH modem admin page? I've connected the FTTH modem ( to an...