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Welcome!- What Hardware version is your modem? Look at the sticker under modem.
- Link>What Firmware version is currently loaded? Found on the modems web page under status.
- What region are you located?
I would review the user manual for any parental controls or port filter controls...
I recommend that you phone contact your regional D-Link support office and ask for help and information regarding this. We find that phone contact has better immediate results over using email.
Let us know how it goes please.