I'm sorry to hear you're having trouble connecting to PSN through your VM connection. We're trying to get to the bottom of the issue, but need a bit of info from you to allow us to do this. I've linked a thread below where I've posted some instructions (post #24 in the thread), could you take a look and post the relevant info asap please?
This is a complete waste of time. You've been asking people to do this 2 weeks ago so it obviously has no baring on anything as you would have fixed this problem by now. My Virgin subscription is getting cancelled tomorrow and I'm going back to sky. Terrible service from Virgin media.
Switched my router to modem mode and I can sign into psn. Disable modem mode and switch it to router mode and it doesn't work again. This sounds like something virgin have done with the ports or something.
I really am going round the twist after 3 days of troubleshooting, restarting the router and PS4 every at least 20 times, even resetting my PS4 to factory defaults. I am not very clued up on networking etc so I am basically stuck reading random forum posts hoping to find an answer - mucho frustrating!