I also encountered the exact same problems as karlm. However after so much playing around I finally figured out a solution that works for me. I hope this works for everyone else, at least at this point its worth a try .
After following the instructions wd2go I finally decide to change the entire setup.
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Do not forward any ports in your router
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Enable UPnP on your router ( I think most or all Routers support this) check your router manual if unsure)
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Access your dashboard "settings > Remote Access > check Automatic from the connection options dropdown
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Disable your Remote Access by unchecking “Remote Access” check box
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Restart MyBookLive via settings > Utilities > Reboot/Shut Down > click “Reboot Device”
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Once device is rebooted re-enable your device access following step 4.
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Assuming steps 1 to 6 have gone through successfully you should now see “Connected”
Port forwarding connection established.
* to be sure that this will all work lets clear some cache and change some Java options
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Clear your browser cache(this should be pretty straight forward)
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Clear your java cache by accessing your control panel > Java > General Tab > settings> click on Delete files button
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Delete any related certificates via control panel > Java > Security Click Certificates Button > highlight and click remove to remove unwanted certificates.
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Ok now you are ready to try accessing your network drive via www.wd2go.com