WNDR4300-Cannot connect to Playstation Network/Tried it all!

Just inherited the Netgear WNDR4300 when my old Apple Time Capsule finally kicked the bucket,set up my network and now the only thing I can't connect to is the Playstation Network. Everything else (including browsing on the Playstation) works. Have updated it to the V1.0.2.104 firmware.

I have tried wired/wireless

I have checked the ports

I have tried changing MTU size

I have ensured UPnP is enabled, and have toggled it on/off

I have tried open/secure NAT

I have tried Disabling SIP ALG

I have tried a DMZ server

and I have rebooted, power cycled a bunch of times. Nothing works.

I've checked the community and cannot find a solution--there are some threads that mention some of the above but these methods have failed.

If someone could please assist it would be appreciated!