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[monkeylove]

I have the ff. set up:

Fiber optic DSL
Location: Southeast Asia
FW 2.00 (initial)
Settings: default, QOS is activated, static IP addresses for wired devices

I used ShieldsUp! (SU) at grc.com, and it reported that port 50 is open.

I checked for new FW versions using the firmware section of the router configurations and it reported a new version, 2.05, which I installed.

I rechecked with SU and it reported all ports in stealth. However, after several hours, any device connected to the router could no longer access Facebook and Google.

I pinged both sites and results showed no delays or errors. The problem disappeared only if I did one of the ff.:

   - Power-cycled the router (and in some cases, the modem as well).
   - Released and renewed the DHCP.
   - Factory reset the router (and checking to update the router system date and time).

I tried various configurations:

   - Disabled unicasting
   - Disabled DNS relay
   - Disabled QOS
   - Removed static IP addresses
   - Used another MTU
   
but they did not work.

I used another router and the problem did not take place.

Finally, I downgraded to FW 2.01 HW B1, and the problem disappeared.

[FurryNutz]

Glad you got it working. Enjoy. 

[monkeylove]

Unfortunately, SU and Rapid7 report that the UPnP is vulnerable, so I had to disable it and forward ports manually.

[FurryNutz]

I would phone contact your regional D-Link support office and inquired with them about uPnP.

Unfortunately, SU and Rapid7 report that the UPnP is vulnerable, so I had to disable it and forward ports manually.