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ISP : [/COLOR]

Dear Folks,

There is a remote Client who wants to reach my PC behind my TL MR3020 modem.
At first my PC was not reachable.


I enabled DMZ on the modem. My PC is reachable.
Then I disable DMZ, but my PC is still reachable.
Then I reboot the Modem, my PC is still reachable from the Remote Client.

How can I solve this problem?

Firmware is latest: 3.17.2 Build 150921 Rel.62529n