Probably not really a big deal, but this has happened a few times in the past couple of weeks.
Anybody know why it's like this?
You attempted to reach (you need an account to see links), but instead you actually reached a server identifying itself assecure.neopets.com. This may be caused by a misconfiguration on the server or by something more serious. An attacker on your network could be trying to get you to visit a fake (and potentially harmful) version of(you need an account to see links).
You should not proceed, especially if you have never seen this warning before for this site.